[FEATURE] Allow using multiple controllers with only one controller.

[teakhanirons]

Some games like GoldenEye and Perfect Dark or modifications like Analog Camera for Mario 64 allow using multiple controllers for more button configurations (for example analog sticks).

Maybe a special boolean that disables inputs from every physical controller other than the first one but allows setting its' buttons to every emulated controller/sets the second emulated analog to the first physical controller would be nice.