As far as I know, the current DTXMania songlist commands are Speed Increase (Bass, Bass); Difficulty Change (HH, HH), Assign Auto (HT, HH, HT, HT). Basically, all of the ones exist from the majority of the games except the new method used in V4 and up. Oh, and I think I remember there being one where the Floor Tom could be used to put in a code, but I've never used it and have since forgotten what it was and what it did. :P
set.def / box.def file specifications
Those are the details on getting the box.def files working so that you can sort folders as well.