What I would do is install kiosk mode from HACS. Build a dashboard for them that only shows what you want them to see, then add kiosk mode so they can’t access the menus. Set it as their default and it should be fine

In competitive games, as you pointed out, it doesn’t really. Usually they end up with controller only servers.

In a co-op game it doesn’t really matter that much. I would argue it’s more about the movement than the shooting anyway.