diff --git a/BizHawk.Client.Common/lua/EmuLuaLibrary.Emu.cs b/BizHawk.Client.Common/lua/EmuLuaLibrary.Emu.cs
index 28f58d54e3..c934cbfc6f 100644
--- a/BizHawk.Client.Common/lua/EmuLuaLibrary.Emu.cs
+++ b/BizHawk.Client.Common/lua/EmuLuaLibrary.Emu.cs
@@ -26,39 +26,6 @@ namespace BizHawk.Client.Common
 
 		public override string Name { get { return "emu"; } }
 
-		private static void SetrenderplanesDo(IList<object> luaParam)
-		{
-			if (Global.Emulator is NES)
-			{
-				// in the future, we could do something more arbitrary here.
-				// but this isn't any worse than the old system
-				var s = (NES.NESSettings)Global.Emulator.GetSettings();
-				s.DispSprites = (bool)luaParam[0];
-				s.DispBackground = (bool)luaParam[1];
-				Global.Emulator.PutSettings(s);
-			}
-			else if (Global.Emulator is PCEngine)
-			{
-				var s = (PCEngine.PCESettings)Global.Emulator.GetSettings();
-				s.ShowOBJ1 = (bool)luaParam[0];
-				s.ShowBG1 = (bool)luaParam[1];
-				if (luaParam.Count > 2)
-				{
-					s.ShowOBJ2 = (bool)luaParam[2];
-					s.ShowBG2 = (bool)luaParam[3];
-				}
-
-				Global.Emulator.PutSettings(s);
-			}
-			else if (Global.Emulator is SMS)
-			{
-				var s = (SMS.SMSSettings)Global.Emulator.GetSettings();
-				s.DispOBJ = (bool)luaParam[0];
-				s.DispBG = (bool)luaParam[1];
-				Global.Emulator.PutSettings(s);
-			}
-		}
-
 		[LuaMethodAttributes(
 			"displayvsync",
 			"Sets the display vsync property of the emulator"
@@ -159,14 +126,47 @@ namespace BizHawk.Client.Common
 			"setrenderpanes",
 			"Toggles the drawing of sprites and background planes. Set to false or nil to disable a pane, anything else will draw them"
 		)]
-		public static void SetRenderPlanes( // For now, it accepts arguments up to 5.
-			object param0, 
-			object param1 = null, 
-			object param2 = null,
-			object param3 = null, 
-			object param4 = null)
+		public static void SetRenderPlanes(params bool[] luaParam)
 		{
-			SetrenderplanesDo(LuaVarArgs(param0, param1, param2, param3, param4));
+			if (Global.Emulator is NES)
+			{
+				// in the future, we could do something more arbitrary here.
+				// but this isn't any worse than the old system
+				var s = (NES.NESSettings)Global.Emulator.GetSettings();
+				s.DispSprites = (bool)luaParam[0];
+				s.DispBackground = (bool)luaParam[1];
+				Global.Emulator.PutSettings(s);
+			}
+			else if (Global.Emulator is PCEngine)
+			{
+				var s = (PCEngine.PCESettings)Global.Emulator.GetSettings();
+				s.ShowOBJ1 = GetSetting(0, luaParam);
+				s.ShowBG1 = GetSetting(1, luaParam);
+				if (luaParam.Length > 2)
+				{
+					s.ShowOBJ2 = GetSetting(2, luaParam);
+					s.ShowBG2 = GetSetting(3, luaParam);
+				}
+
+				Global.Emulator.PutSettings(s);
+			}
+			else if (Global.Emulator is SMS)
+			{
+				var s = (SMS.SMSSettings)Global.Emulator.GetSettings();
+				s.DispOBJ = GetSetting(0, luaParam);
+				s.DispBG = GetSetting(1, luaParam);
+				Global.Emulator.PutSettings(s);
+			}
+		}
+
+		private static bool GetSetting(int index, bool[] settings)
+		{
+			if (index < settings.Length)
+			{
+				return settings[index];
+			}
+
+			return true;
 		}
 
 		[LuaMethodAttributes(