... I've been trying to get these (and DDR Strawberry Shortcake) for the past five years because curiosity kept getting the best of me. But dang...
DDR Disney Mix is exactly like the crappy DDR pirate original pads you can buy at a mall. It even uses generic Famiclone pirate game sound effects. Haze mentioned that Famiclone-based games are much more advanced now, but I seriously wouldn't be surprised if this game ended up being created by a Chinese Famiclone original game developer and it had an NES on a chip inside of it.
I'm looking forward to finding out what makes these tick.