Dan, I don't know if you have any experience with these. Midi Designer would act as GUI or visual reference to setting up the DrumKat. The present method is to press different footswitches while tapping on individual pads to set up the pads to perform various tasks. The simplest one is to make a drum set for performance.
The first one, the DK10 was the simplest to "program" for lack of a better term. It had limited features. With each new generation, the DrumKat grew in its abilities and the setup became more complicated. It's like going 100 years into cave with a AA flashlight and reading a map. You get so far in, can't orient the map and forget how you go to that point. Once you back out, you have to try to remember all of the steps to get to where you're trying to go.
I just thought that the Midi Designer could be a help by maybe each page representing a corresponding programming mode. The flow chart of different mode could be successive pages maybe?