I would like it if the PEK did not make sounds while you were scrolling through presets- I believe that is a bug DSI is aware of.
Also, I would like the option of when you tweak a parameter, either it stays on the last parameter tweaked (current default) or it changes back to the Program Menu after several (5? 10?) seconds. If you are playing and tweaking parameters, then need to switch programs, it requires an extra button push to get back to the program menu. Not a biggie, but it can be important in live performance if you are playing the knobs then need to change programs quickly.