I'd really just like to be able to save a rig on a track in my DAW in an effect slot, open the effect click a button and have that rig loaded back up again on my Kemper. Or mess around on the Kemper, add the VST to a track and press a button to store the current rig for recall whenever I need it later.
So yea. Real simple is all I need. Two big buttons. "Store" and "Recall" and I'm good. Not that I wouldn't love to see the full rig manager in VST form, but I really only care about retaining the rig on a track.
If you want to get fancy have it store a Performance rather than just a rig, and the midi stuff about switching between the rigs and stomps in the performance through the VST, well I won't complain. I only really need the super simple version though.