I could be practical to have an easy way to revert the current slot to what is previously saved while editing a performance in performance-mode. The 3rd key above the display is unused in this context and could be made "Revert to saved". It would also become an indication of unsaved changes if the key only lights up after something has been changed.
I know it it possible to revert everything by switching to a different performance and back, but that would also reset all unsaved edits to all other slots in the same performance.
Btw, the term performance still confuses me after a year and a half with my KPA. Maybe I'm messing about with too many other MIDI-controlled boxes, but to me it would make more sense to call the performances "banks" instead. The term "performance mode" as opposed to "browse mode" OTOH is just fine.