After playing BlazBlue 3, one thing I hope DOA6 has (I'm not expecting LR to have it, but they could do it) is to simply let us choose ANY music track prior to the start of a fight, or let us at least choose a track for certain stages or the character we use in a proper format (not the dumb shit it is atm).
As it is, the music is randomly picked depending on the two characters in the fight. I love how BBCP just lets you choose whichever track you want beforehand.
Maybe only have the stage/character custom track pre-picks (but not in the dumb way it is now) work for online fights, though, to perhaps reduce wait time, as some people might spend the whole timer picking a track.
But basically, yeah - pre-fight full choice music track selection.