Two set of Controllers ingame
If you could have the option in the in-game setup where you can switch from "Set 1" and "Set 2" or "Casual" and "Special". It would be one with the normal controllers and one with the setup you've fixed yourself (or you can change them both). In that way you can easy switch back to the controllers you like, after your friend have played, or you've tried something new yourself.
I would love this so I could test out new controllers myself. It would also be awesome after a friend has played a game at your place and changed the controllers. You can just switch back, easy as that.
I think more people than me have other keybindings than the most, and it could help a lot.
Sorry for bad English. Not my native language.
-Ninja Noxxics