A couple of Ideas:
1st Cuepoints, A right click on the line number could create/delete a cuepoint (I would say 16 would be a nice amount of cues for MPC style drumming) then a key, midi assign or even new gui buttons would jump straight to that point in the song:
2nd Skip section in sequence, Would be nice to have a section in the song that could be used as a kind of clipboard.