Trip101

Hi There, Apologies if this has been asked before, but I couldn't find anything on it. Im planning to build a bartop or full arcade cabinet with full 2 player arcade stick setup and an option to plug in a USB game-pad for new games requiring 2 analogue sticks for movement and camera controls. My question is really is this possible for BigBox/LaunchBox to recognise me plugging in the game-pad and being able to use it for PS2 games lets say and then back out and carry on using the arcade sticks & buttons. Sorry for long winded question just wanted to make sure im asking the right things. Cheers