1) ability to mute a clip... Can accomplish this by deleting but being able to leave the clip there muted would be faster, especially after adding other tracks you decide you need it back.
2) Rejoin sliced clips
3) Ability to duplicate an entire track
4) Ability to reorder tracks
5) Folder tracks would be cool
6) More tracks, even if by placing a group of tracks in a folder and "freezing" that track.
7) Bigger meter to see clips, etc.
8) ability to minimize tracks making room to see more on the screen... Some tracks could be normal height and others smaller.
9) Groove smoothing like Mac version of GarageBand.
10) midi would ne nice
11) Integrate Toon Traks EZ Drummer inside it
All that said, I love his app. I have some pretty good desktop stuff and I'm recording my upcoming 6th CD with this app. How cool is that.