I'd like to second this, but what I'd really like is a program that used Stepmania simfiles (.sm) instead of the .bxe/.bxs format. It needn't be a direct port of Stepmania to use its file format, see Beats Portable
It looks like the original GP2X version had support for USB dance pads though, that would be a cool feature to have on a future GCW version with USB-OTG.
GBC,GBA,GBA SP,NDS,NGPC,Panasonic FZ-10 3DO,NES,Sega Nomad,Sega CDX w/Power Base Converter,PS1,PS2,PS3,Saturn,Dreamcast,PC (Win 98, XP, 7),Dingoo A320,Dingoo A330,Gemei A330,LetCool N350JP,PAP-GAMETA,GCW-Zero SE,Kyocera Rise,2DS,GP2X-F100,GPD G7,JXD 100,JXD A1000,JXD A3300,JXD F3000,JXD V5000,JXD S7300B,Hyperkin SupaBoy
Currently playing: Theatrhythm Final Fantasy Curtain Call (2DS)