Smart file relinking... say if i selcet one to relink, it sees others, and .... they're done.
Next song fade in, when you click next, instead of a sudden jump to the next track, it fades in, obviously that would be optional.
A DJ setup, where i can cue another song while another plays, via a headphone sampler USB device or something, would make iTunes great for that wanna be DJ.
Menu bar support, I use an older FREE version of M-Beat that i skinned, looks good, but not enough features.
A way to remove duplicate tracks, and not have tracks i click to open that are not in any of my playlist be included in my Library. I have a lot of songs in my library that either is a duplicate, or some other track, wasting space and giving me incorrect file count.
Optimize the play list, go in clean up, fresh new file, which will be smaller is size.
Less CPU usage
I guess thats all for now.