It would be interesting to do a dedicated foot pac controller.
Actually at one of the (two) arcade auctions I have been to there was this game called spider stomp:
It went for more than I could afford, but made me think about what kind of games (even educational games, like what you might find in a museum or whatever) you could build with a similar idea (foot switches). Maybe I will hack the dance pad into a game like that someday so it can continue its destiny of being stomped on.
(I would say I just need to find a 360 copy of a DDR game, but my PS2 dance pads are still collecting dust in the closet... as they have been for many, many years.)