The deck feature is really nice, but I've found for certain decks/cards, the basic default size is too small to see the contents of the card. For example, I just put a bunch of Tarot card images in and, unless you can figure out which card it is from the art, there's just no way to read the text. It'd be nice to be able to either resize the deck, or better yet, to set an option for each deck saying what its size should be.
