I would find it very useful to have Big Picture mode (and games launched through Big Picture mode) accept input from a controller, even when steam or the game are not focused.

I want to be able to work in my sculpting software while I still have control over my game so I can get multiple angles of my reference dynamically without having to use 2 pc's.

It would also make playing RPGs for short periods of time during my work breaks much less clunky. I currently find myself playing more games on my switch even though I would prefer playing on my pc, if it were not for the clunky feeling of tabbing in and out and having to play "find the mouse cursor"