I use Google Cardboard via TrinusVR and have a gamepad, which works exactly like Xbox 360 one in almost every game on Steam, but I can't trigger the Panic mode in VRChat. When I use one button for menu, it tabs out of the game, also making me unable to do anything on controller and second button for menu opens Steam overlay keyboard. I think both triggers + something is not a good choice Panic mode, as both triggers are used for many actions in Steam itself.