I'm working on a game that uses multiple, custom decks of standard playing cards, one for each player, and Roll20s has been a huge help beta-ing the game, since you can make decks that only contain the specific cards you want. It's a great feature set so far, but there's a few little improvements I think you can add. One thing that would be really nice is if I could adjust the size of the little box where the playing card decks appear when you "show" them on the playmat – right now they just stack up in a line but the box doesn't extend to cover all of the decks, and you have to scroll down to see more of the decks. If it were possible to have the decks appear as objects that you can drag to different areas of the playmat that would be great also.