Well, that MIDI Designer patch editor for the 990 looks incredible.
I wonder if he'll expand it to work with a JV-1080 (which holds more of the expansion cards).
I tend not to do much programming on my 1080 just because it's basically menu-diving and it already has more presets than I'm likely to hear in a lifetime, but it does sound really good. Just a simple mixer interface to mix the separate channels would be helpful too.
I have no doubt that that combo would be a good time, especially if you're running a sequencer as well.