Guitar Hero On Tour idea

was going to buy this one day but was thinking of an idea (maybe somebody already though of it or not possible) as i have a NDSTT.

need the game as u would need it anyway for the holder (not sure wot it is called)
and a NDSTT (or something simliar)

download the rom and hack it so there no songs on it and loads custom songs from a folder or file type (Songs/Paint It Black - Rolling Stones.* or just Paint It Black - Rolling Stones.* in the same folder as the rom) that holds info on all the difficulties and hi-score from them difficulties so when u load it from the NDSTT (with the holder thing in) all you will see in the list is the song(s) that you have put on, so full songs heaven though your ds might be a bit scratched after playing full songs lol

wot do others think to this idea?