diff --git a/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp b/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp
index 1c0da74a0f..dbecadb1d8 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Dynamics.cpp
@@ -330,8 +330,7 @@ void EmulateIMUCursor(IMUCursorState* state, ControllerEmu::IMUCursor* imu_ir_gr
   auto target_yaw = std::clamp(yaw, -max_yaw, max_yaw);
 
   // Handle the "Recenter" button being pressed.
-  if (imu_ir_group->controls[0]->control_ref->State() >
-      ControllerEmu::Buttons::ACTIVATION_THRESHOLD)
+  if (imu_ir_group->controls[0]->control_ref->GetState<bool>())
   {
     state->recentered_pitch = std::asin((inv_rotation * Common::Vec3{0, 1, 0}).z);
     target_yaw = 0;
diff --git a/Source/Core/DolphinQt/Config/Mapping/MappingButton.cpp b/Source/Core/DolphinQt/Config/Mapping/MappingButton.cpp
index 9dcb9d0766..f6f68d15ff 100644
--- a/Source/Core/DolphinQt/Config/Mapping/MappingButton.cpp
+++ b/Source/Core/DolphinQt/Config/Mapping/MappingButton.cpp
@@ -132,11 +132,9 @@ void MappingButton::UpdateIndicator()
   if (!isActiveWindow())
     return;
 
-  const auto state = m_reference->State();
-
   QFont f = m_parent->font();
 
-  if (state > ControllerEmu::Buttons::ACTIVATION_THRESHOLD)
+  if (m_reference->GetState<bool>())
     f.setBold(true);
 
   setFont(f);
diff --git a/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.cpp b/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.cpp
index a0921ec9f3..0d6570e87d 100644
--- a/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.cpp
+++ b/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.cpp
@@ -4,6 +4,8 @@
 
 #include "DolphinQt/Config/Mapping/MappingNumeric.h"
 
+#include <limits>
+
 #include "DolphinQt/Config/Mapping/MappingWidget.h"
 
 #include "InputCommon/ControllerEmu/ControllerEmu.h"
@@ -12,24 +14,20 @@
 MappingDouble::MappingDouble(MappingWidget* parent, ControllerEmu::NumericSetting<double>* setting)
     : QDoubleSpinBox(parent), m_setting(*setting)
 {
-  setRange(m_setting.GetMinValue(), m_setting.GetMaxValue());
   setDecimals(2);
 
-  setFixedWidth(WIDGET_MAX_WIDTH);
-
-  if (const auto ui_suffix = m_setting.GetUISuffix())
-    setSuffix(QLatin1Char{' '} + tr(ui_suffix));
-
   if (const auto ui_description = m_setting.GetUIDescription())
     setToolTip(tr(ui_description));
 
   connect(this, QOverload<double>::of(&QDoubleSpinBox::valueChanged), this,
           [this, parent](double value) {
             m_setting.SetValue(value);
+            ConfigChanged();
             parent->SaveSettings();
           });
 
   connect(parent, &MappingWidget::ConfigChanged, this, &MappingDouble::ConfigChanged);
+  connect(parent, &MappingWidget::Update, this, &MappingDouble::Update);
 }
 
 // Overriding QDoubleSpinBox's fixup to set the default value when input is cleared.
@@ -41,6 +39,36 @@ void MappingDouble::fixup(QString& input) const
 void MappingDouble::ConfigChanged()
 {
   const QSignalBlocker blocker(this);
+
+  QString suffix;
+
+  if (const auto ui_suffix = m_setting.GetUISuffix())
+    suffix += QLatin1Char{' '} + tr(ui_suffix);
+
+  if (m_setting.IsSimpleValue())
+  {
+    setRange(m_setting.GetMinValue(), m_setting.GetMaxValue());
+    setButtonSymbols(ButtonSymbols::UpDownArrows);
+  }
+  else
+  {
+    constexpr auto inf = std::numeric_limits<double>::infinity();
+    setRange(-inf, inf);
+    setButtonSymbols(ButtonSymbols::NoButtons);
+    suffix += QString::fromUtf8(" 🎮");
+  }
+
+  setSuffix(suffix);
+
+  setValue(m_setting.GetValue());
+}
+
+void MappingDouble::Update()
+{
+  if (m_setting.IsSimpleValue() || hasFocus())
+    return;
+
+  const QSignalBlocker blocker(this);
   setValue(m_setting.GetValue());
 }
 
@@ -49,14 +77,31 @@ MappingBool::MappingBool(MappingWidget* parent, ControllerEmu::NumericSetting<bo
 {
   connect(this, &QCheckBox::stateChanged, this, [this, parent](int value) {
     m_setting.SetValue(value != 0);
+    ConfigChanged();
     parent->SaveSettings();
   });
 
   connect(parent, &MappingWidget::ConfigChanged, this, &MappingBool::ConfigChanged);
+  connect(parent, &MappingWidget::Update, this, &MappingBool::Update);
 }
 
 void MappingBool::ConfigChanged()
 {
   const QSignalBlocker blocker(this);
+
+  if (m_setting.IsSimpleValue())
+    setText({});
+  else
+    setText(QString::fromUtf8("🎮"));
+
+  setChecked(m_setting.GetValue());
+}
+
+void MappingBool::Update()
+{
+  if (m_setting.IsSimpleValue())
+    return;
+
+  const QSignalBlocker blocker(this);
   setChecked(m_setting.GetValue());
 }
diff --git a/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.h b/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.h
index 49817ea40c..267f556e7e 100644
--- a/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.h
+++ b/Source/Core/DolphinQt/Config/Mapping/MappingNumeric.h
@@ -21,6 +21,7 @@ private:
   void fixup(QString& input) const override;
 
   void ConfigChanged();
+  void Update();
 
   ControllerEmu::NumericSetting<double>& m_setting;
 };
@@ -32,6 +33,7 @@ public:
 
 private:
   void ConfigChanged();
+  void Update();
 
   ControllerEmu::NumericSetting<bool>& m_setting;
 };
diff --git a/Source/Core/DolphinQt/Config/Mapping/MappingWidget.cpp b/Source/Core/DolphinQt/Config/Mapping/MappingWidget.cpp
index 1e2aabd3ec..5ba6e70e29 100644
--- a/Source/Core/DolphinQt/Config/Mapping/MappingWidget.cpp
+++ b/Source/Core/DolphinQt/Config/Mapping/MappingWidget.cpp
@@ -11,6 +11,7 @@
 #include <QPushButton>
 #include <QTimer>
 
+#include "DolphinQt/Config/Mapping/IOWindow.h"
 #include "DolphinQt/Config/Mapping/MappingButton.h"
 #include "DolphinQt/Config/Mapping/MappingIndicator.h"
 #include "DolphinQt/Config/Mapping/MappingNumeric.h"
@@ -141,7 +142,31 @@ QGroupBox* MappingWidget::CreateGroupBox(const QString& name, ControllerEmu::Con
     }
 
     if (setting_widget)
-      form_layout->addRow(tr(setting->GetUIName()), setting_widget);
+    {
+      const auto hbox = new QHBoxLayout;
+      hbox->addWidget(setting_widget);
+
+      const auto advanced_button = new QPushButton(tr("..."));
+      advanced_button->setFixedWidth(
+          QFontMetrics(font()).boundingRect(advanced_button->text()).width() * 2);
+
+      hbox->addWidget(advanced_button);
+
+      advanced_button->connect(
+          advanced_button, &QPushButton::clicked, [this, &setting = *setting.get()]() {
+            setting.SetExpressionFromValue();
+
+            IOWindow io(this, GetController(), &setting.GetInputReference(), IOWindow::Type::Input);
+            io.exec();
+
+            setting.SimplifyIfPossible();
+
+            ConfigChanged();
+            SaveSettings();
+          });
+
+      form_layout->addRow(tr(setting->GetUIName()), hbox);
+    }
   }
 
   if (group->can_be_disabled)
diff --git a/Source/Core/DolphinQt/Config/Mapping/MappingWidget.h b/Source/Core/DolphinQt/Config/Mapping/MappingWidget.h
index a88c09b4ed..707332ccd8 100644
--- a/Source/Core/DolphinQt/Config/Mapping/MappingWidget.h
+++ b/Source/Core/DolphinQt/Config/Mapping/MappingWidget.h
@@ -14,7 +14,6 @@ constexpr int WIDGET_MAX_WIDTH = 112;
 
 class ControlGroupBox;
 class InputConfig;
-class IOWindow;
 class MappingButton;
 class MappingNumeric;
 class MappingWindow;
diff --git a/Source/Core/InputCommon/ControlReference/ControlReference.h b/Source/Core/InputCommon/ControlReference/ControlReference.h
index 539c7f4927..80c4a65d51 100644
--- a/Source/Core/InputCommon/ControlReference/ControlReference.h
+++ b/Source/Core/InputCommon/ControlReference/ControlReference.h
@@ -7,6 +7,7 @@
 #include <memory>
 
 #include "InputCommon/ControlReference/ExpressionParser.h"
+#include "InputCommon/ControlReference/FunctionExpression.h"
 #include "InputCommon/ControllerInterface/Device.h"
 
 // ControlReference
@@ -30,6 +31,9 @@ public:
   virtual ControlState State(const ControlState state = 0) = 0;
   virtual bool IsInput() const = 0;
 
+  template <typename T>
+  T GetState();
+
   int BoundCount() const;
   ciface::ExpressionParser::ParseStatus GetParseStatus() const;
   void UpdateReference(ciface::ExpressionParser::ControlEnvironment& env);
@@ -45,6 +49,18 @@ protected:
   ciface::ExpressionParser::ParseStatus m_parse_status;
 };
 
+template <>
+inline bool ControlReference::GetState<bool>()
+{
+  return State() > ciface::ExpressionParser::CONDITION_THRESHOLD;
+}
+
+template <typename T>
+T ControlReference::GetState()
+{
+  return State();
+}
+
 //
 // InputReference
 //
diff --git a/Source/Core/InputCommon/ControlReference/FunctionExpression.cpp b/Source/Core/InputCommon/ControlReference/FunctionExpression.cpp
index 75f78526e6..4d8e2866db 100644
--- a/Source/Core/InputCommon/ControlReference/FunctionExpression.cpp
+++ b/Source/Core/InputCommon/ControlReference/FunctionExpression.cpp
@@ -10,8 +10,6 @@
 
 namespace ciface::ExpressionParser
 {
-constexpr ControlState CONDITION_THRESHOLD = 0.5;
-
 using Clock = std::chrono::steady_clock;
 using FSec = std::chrono::duration<ControlState>;
 
diff --git a/Source/Core/InputCommon/ControlReference/FunctionExpression.h b/Source/Core/InputCommon/ControlReference/FunctionExpression.h
index e247d9a623..3b29baa9ae 100644
--- a/Source/Core/InputCommon/ControlReference/FunctionExpression.h
+++ b/Source/Core/InputCommon/ControlReference/FunctionExpression.h
@@ -15,6 +15,8 @@
 
 namespace ciface::ExpressionParser
 {
+constexpr ControlState CONDITION_THRESHOLD = 0.5;
+
 class FunctionExpression : public Expression
 {
 public:
diff --git a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Buttons.h b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Buttons.h
index c2311415e5..9560a37843 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Buttons.h
+++ b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Buttons.h
@@ -24,13 +24,11 @@ public:
   {
     for (auto& control : controls)
     {
-      if (control->control_ref->State() > ACTIVATION_THRESHOLD)
+      if (control->control_ref->GetState<bool>())
         *buttons |= *bitmasks;
 
       bitmasks++;
     }
   }
-
-  static constexpr ControlState ACTIVATION_THRESHOLD = 0.5;
 };
 }  // namespace ControllerEmu
diff --git a/Source/Core/InputCommon/ControllerEmu/ControlGroup/ModifySettingsButton.cpp b/Source/Core/InputCommon/ControllerEmu/ControlGroup/ModifySettingsButton.cpp
index 908de81a96..a902034795 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControlGroup/ModifySettingsButton.cpp
+++ b/Source/Core/InputCommon/ControllerEmu/ControlGroup/ModifySettingsButton.cpp
@@ -35,19 +35,19 @@ void ModifySettingsButton::GetState()
 {
   for (size_t i = 0; i < controls.size(); ++i)
   {
-    ControlState state = controls[i]->control_ref->State();
+    const bool state = controls[i]->control_ref->GetState<bool>();
 
     if (!associated_settings_toggle[i])
     {
       // not toggled
-      associated_settings[i] = state > ACTIVATION_THRESHOLD;
+      associated_settings[i] = state;
     }
     else
     {
       // toggle (loading savestates does not en-/disable toggle)
       // after we passed the threshold, we en-/disable. but after that, we don't change it
       // anymore
-      if (!threshold_exceeded[i] && state > ACTIVATION_THRESHOLD)
+      if (!threshold_exceeded[i] && state)
       {
         associated_settings[i] = !associated_settings[i];
 
@@ -59,7 +59,7 @@ void ModifySettingsButton::GetState()
         threshold_exceeded[i] = true;
       }
 
-      if (state < ACTIVATION_THRESHOLD)
+      if (!state)
         threshold_exceeded[i] = false;
     }
   }
diff --git a/Source/Core/InputCommon/ControllerEmu/ControllerEmu.cpp b/Source/Core/InputCommon/ControllerEmu/ControllerEmu.cpp
index c5ff0705a2..5d4d16fe76 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControllerEmu.cpp
+++ b/Source/Core/InputCommon/ControllerEmu/ControllerEmu.cpp
@@ -14,6 +14,7 @@
 #include "InputCommon/ControllerEmu/Control/Control.h"
 #include "InputCommon/ControllerEmu/ControlGroup/Attachments.h"
 #include "InputCommon/ControllerEmu/ControlGroup/ControlGroup.h"
+#include "InputCommon/ControllerEmu/Setting/NumericSetting.h"
 #include "InputCommon/ControllerInterface/ControllerInterface.h"
 
 namespace ControllerEmu
@@ -54,6 +55,9 @@ void EmulatedController::UpdateReferences(ciface::ExpressionParser::ControlEnvir
     for (auto& control : ctrlGroup->controls)
       control->control_ref->UpdateReference(env);
 
+    for (auto& setting : ctrlGroup->numeric_settings)
+      setting->GetInputReference().UpdateReference(env);
+
     // Attachments:
     if (ctrlGroup->type == GroupType::Attachments)
     {
diff --git a/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h b/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
index 108b228049..6884e7756b 100644
--- a/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
+++ b/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
@@ -9,6 +9,7 @@
 
 #include "Common/CommonTypes.h"
 #include "Common/IniFile.h"
+#include "InputCommon/ControlReference/ControlReference.h"
 #include "InputCommon/ControllerInterface/Device.h"
 
 namespace ControllerEmu
@@ -52,6 +53,15 @@ public:
   virtual void LoadFromIni(const IniFile::Section& section, const std::string& group_name) = 0;
   virtual void SaveToIni(IniFile::Section& section, const std::string& group_name) const = 0;
 
+  virtual InputReference& GetInputReference() = 0;
+  virtual const InputReference& GetInputReference() const = 0;
+
+  // Convert a literal expression e.g. "7.0" to a regular value. (disables expression parsing)
+  virtual void SimplifyIfPossible() = 0;
+
+  // Convert a regular value to an expression. (used before expression editing)
+  virtual void SetExpressionFromValue() = 0;
+
   virtual SettingType GetType() const = 0;
 
   const char* GetUIName() const;
@@ -84,16 +94,47 @@ public:
 
   void LoadFromIni(const IniFile::Section& section, const std::string& group_name) override
   {
-    ValueType value;
-    section.Get(group_name + m_details.ini_name, &value, m_default_value);
-    SetValue(value);
+    std::string str_value;
+    if (section.Get(group_name + m_details.ini_name, &str_value))
+    {
+      m_value.m_input.SetExpression(std::move(str_value));
+      SimplifyIfPossible();
+    }
+    else
+    {
+      SetValue(m_default_value);
+    }
   }
 
   void SaveToIni(IniFile::Section& section, const std::string& group_name) const override
   {
-    section.Set(group_name + m_details.ini_name, GetValue(), m_default_value);
+    if (IsSimpleValue())
+      section.Set(group_name + m_details.ini_name, GetValue(), m_default_value);
+    else
+      section.Set(group_name + m_details.ini_name, m_value.m_input.GetExpression(), "");
   }
 
+  bool IsSimpleValue() const { return m_value.IsSimpleValue(); }
+
+  void SimplifyIfPossible() override
+  {
+    ValueType value;
+    if (TryParse(m_value.m_input.GetExpression(), &value))
+      m_value.SetValue(value);
+  }
+
+  void SetExpressionFromValue() override
+  {
+    if (!IsSimpleValue())
+      return;
+
+    // Cast to double to prevent bool -> "true"/"false" strings.
+    m_value.m_input.SetExpression(ValueToString(static_cast<double>(GetValue())));
+  }
+
+  InputReference& GetInputReference() override { return m_value.m_input; }
+  const InputReference& GetInputReference() const override { return m_value.m_input; }
+
   ValueType GetValue() const { return m_value.GetValue(); }
   void SetValue(ValueType value) { m_value.SetValue(value); }
 
@@ -119,13 +160,30 @@ class SettingValue
   friend class NumericSetting<T>;
 
 public:
-  ValueType GetValue() const { return m_value; }
+  ValueType GetValue() const
+  {
+    if (IsSimpleValue())
+      return m_value;
+    else
+      return m_input.GetState<ValueType>();
+  }
+
+  bool IsSimpleValue() const { return m_input.GetExpression().empty(); }
 
 private:
-  void SetValue(ValueType value) { m_value = value; }
+  void SetValue(ValueType value)
+  {
+    m_value = value;
+
+    // Clear the expression to use our new "simple" value.
+    m_input.SetExpression("");
+  }
 
   // Values are R/W by both UI and CPU threads.
   std::atomic<ValueType> m_value = {};
+
+  // Unfortunately InputReference's state grabbing is non-const requiring mutable here.
+  mutable InputReference m_input;
 };
 
 }  // namespace ControllerEmu