Here are three:
1. Distortion: I know other people have said this, but I wanted to reiterate that it would be really nice to have.
2. Two Presets at one time: Again, I know people want it, but wanted to add my support.
3. Master/Slave presets for H9 and Core: This could be a pseudo work around for two presets at once. So, I have an H9 and a Core. I control them using a midi controller. But it is hard to keep track of the combinations that sound good. It would be cool if you could save a "preset" that would have two presets, so that when you could call up that preset, it would load the one preset on the H9 and load the other on the core. Does that make sense?