Prey was great in that department actually having a config that mapped mouse to the right touchpad instead of emulating a joystick like so many games did, and then had different action sets that automatically switched depending on if it was gameplay or you were in the menu. And showed proper icons like the touchpad click to reflect Steam Input mappings people set it to.
Right now has to be the 8bitdo Ultimate 2 wireless. Not the bluetooth switch one. Need to update the dongle and controller to the latest beta firmware and launch it in dinput mode by turning it on while holding the B button. Then all the extra buttons can be mapped along with using gyro with analog triggers, which couldn’t be done before.
There is a bug that needs to be fixed where rumble can cause the controller to stop working in game, so for now need to use it with rumble off until that is fixed. But, everything else works when it comes to binding through Steam Input.