Personally, i would like to see segmented downloads... it has been very useful for me (self-confessed Xolox user). I also like the configurability of Limewire, which Xolox admittedly left out to provide a simpler interface.

Perhaps a "Simple" mode for newbies and an "Advanced" mode for those of us who like to tweak with our performance settings.

You should also keep a client-side host list, and the ability to edit your preferred autoconnect list.

If i had any progamming knowledge or skill, I'd make one myself.

Good luck.