experimental "Frame Inch" designed to make quick presses of frame advance always do something (concerning #2303).

src/BizHawk.Client.Common/config/Binding.cs

@@ -145,6 +145,7 @@ namespace BizHawk.Client.Common
 						Bind("General", "Screen Client to Clipboard", "Ctrl+Shift+C"),
 						Bind("General", "Toggle Skip Lag Frame"),
 						Bind("General", "Toggle Key Priority"),
+						Bind("General", "Frame Inch"),
 
 						Bind("Save States", "Save State 0", "Shift+F10"),
 						Bind("Save States", "Save State 1", "Shift+F1"),

src/BizHawk.Client.EmuHawk/MainForm.Hotkey.cs

@@ -19,6 +19,10 @@ namespace BizHawk.Client.EmuHawk
 				case "Pause":
 					TogglePause();
 					break;
+				case "Frame Inch":
+					//special! allow this key to get handled as Frame Advance, too
+					FrameInch = true;
+					return false;
 				case "Toggle Throttle":
 					_unthrottled ^= true;
 					ThrottleMessage();

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -771,6 +771,7 @@ namespace BizHawk.Client.EmuHawk
 		public LoadRomArgs CurrentlyOpenRomArgs { get; private set; }
 		public bool PauseAvi { get; set; }
 		public bool PressFrameAdvance { get; set; }
+		public bool FrameInch { get; set; }
 		public bool HoldFrameAdvance { get; set; } // necessary for tastudio > button
 		public bool PressRewind { get; set; } // necessary for tastudio < button
 		public bool FastForward { get; set; }
@@ -2802,8 +2803,25 @@ namespace BizHawk.Client.EmuHawk
 				runFrame = true;
 			}
 
-			if (InputManager.ClientControls["Frame Advance"] || PressFrameAdvance || HoldFrameAdvance)
+
+			bool oldFrameAdvanceCondition = InputManager.ClientControls["Frame Advance"] || PressFrameAdvance || HoldFrameAdvance;
+			if (FrameInch)
 			{
+				FrameInch = false;
+				if (EmulatorPaused || oldFrameAdvanceCondition)
+				{
+					oldFrameAdvanceCondition = true;
+				}
+				else
+				{
+					PauseEmulator();
+					oldFrameAdvanceCondition = false;
+				}
+			}
+
+			if (oldFrameAdvanceCondition || FrameInch)
+			{
+				FrameInch = false;
 				_runloopFrameAdvance = true;
 
 				// handle the initial trigger of a frame advance