digging this up again!
just heard about this game over the weekend, and spent more time tweaking it to fit my cab than i did playing it. anyways, it was totally worth it. i gave it its own menu screen in MaLa (which goes with a graphic explaining how to play it on my 2 player, 6 button each, no mouse setup).
so it took a graphic, using the autohotkey app "nomousy" (as opposed to my old invisible.cur), hacking together an Autohotkey script (based on the numpad-as-mouse script included with it).. and it's working great.
i'm using the top 3 P1 buttons for quickly moving between the 3 lanes (buttons 4 and 6 shift you to the shoulders, when there are any), and the stick left/right works as well... P2 stick & B1 & 2 are the mouse... which makes the 2 player mode work as well (steers good with the in-game mouse sensitivity turned way down).
i did buy it... but of course since my cab isn't even online, i had to use a pirated version for it :p shame it doesn't save local high scores. [ETA Correction: it saves the highest score per song, per difficulty. displayed only when you start the song]
brilliant game.