I'm thinking that each Preset could have an "ALT SCENE" the same way it has an "ALT PRESET" then you could toggle between the current SCENE (default 1) and the ALT SCENE with the switch 
rather than have the SCENE TOGGLE feature only toggle between scenes 1 and 2. Instead, you could toggle between SCENE1 and the ALT SCENE, which by default would be SCENE 2 so that existing presets would not break.
rather than have the SCENE TOGGLE feature only toggle between scenes 1 and 2. Instead, you could toggle between SCENE1 and the ALT SCENE, which by default would be SCENE 2 so that existing presets would not break.