It would be great if the envelopes retriggered while using the sustain pedal. On the OB-6 and Prophet 6 you can activate this via Key Mode, and it works like a charm.
X2. There's a Unison Env Retrig in the program menu that could be applied in poly mode like it does on the OB-6/P6. Right now, if your patch has decay/no sustain/little sustain you can't play more than 5 notes with the sustain pedal down.
I know, some people are saying, why are you using a sustain pedal on a synth? Well, I have a MODX with a sustain pedal that I use for piano sounds, and if I'm using it as a controller to play an analog pad layered with the piano on one of my Sequential synths, I need to have it respond properly when using the sustain pedal; that is, have the envelopes retrigger.
I also second the request to show parameter values/changes in the display. Even better would be to show the current and the saved value of the parameter when the knob is turned/button pushed, that makes it easier to go back to the original value without looking for that tiny dot in the patch number display. It also helps when reverse engineering presets, or explaining them on a forum ("set filter cutoff to 87, env1 decay to 32, etc.")
A P5-style voice allocation scheme (reuse same voice for same note) would be nice to have too.
When on the regular screen (not a menu), the select/value knobs do nothing. One of them could be used to scroll through presets (perhaps while holding down a button to prevent accidental patch changes), or even make them assignable per patch (for example, making one of them control Filter Keytracking and the other Pan Spread).
The basic program (init patch) has LFO1 assigned to Osc1 Fine by default, and mod wheel mapped to LFO1 amount. This is nice for having mod wheel to vibrato mapped by default, but would it make more sense to have LFO1 default to OscAll Fine so both oscillators get vibrato?
That's my wish list for the moment.