Some ideas: Additive resynthesis of full length sounds...or just little snippets, like in Morphine. That combined with the filters and such of Zebra would be epic.
Sample playing: Ability to play a sample at the start of a sound, like a metal hit, and the option to control keyfollow so it doesn't change pitch.
Optional quality mode: Like in Z3ta+. However, you can set if you want to save the quality setting, like Draft, Medium, High, Extra High. That way, you can make lofi-ish effects and/or compose a big 'ol song using a bunch of Zebras without overloading your computer.
Of these three, I'd say the optional quality mode is the one most likely to be added. Anyway, COMMENCE BRAIN STORMING.
