This function seems to be missing in the KPA.
The possible to assign any CC number to any effect and set the active range for the source (Midi pedal) and target (KPA) on a patch basis, i have this on my Boss GT-pro (and VF-1) and for me its pretty much a must if am to get a KPA. Im pretty sure all the Boss GT´s have this function and probably many similar units.
I think its invaluable for getting a good control of effects.
With active range you can for example switch on/off the wah pedal with the same expression pedal you are using to control and also switching on/off several effects simultaneously using only one CC number from the midi pedal. These assigns are per patch also which mean the same CC numbers can be used in a different way in another patch.
The active range settings also helps if your expression pedal isnt very exact and goes out of calibration (and they do), it would suck if the whammy function (if introduced) cant reach the original tuning just because the expression pedal isnt absolutely perfectly calibrated.