There is really only one thing I need that the Kemper currently doesn't offer but it is sufficiently important to have had me trying all the competition in the modelling market and even considering going back to an amp + pedals setup. That is, the inability to adjust the balance between rig levels on the fly during a gig. It is not practical to have to jump on my rack during a performance, make an accurate level adjustment from the front panel and then hit "Store" twice. Of course, I try and get my levels balanced at rehearsal so that it's not necessary to make adjustments during performance but inevitably there will always be points in a show where a solo isn't loud enough or clean and dirty rigs in a performance aren't balanced, etc.
The Axe-FX footcontroller has a feature where the current scene can be levelled up/down and saved on a single button press. Would it be possible to implement something similar with the Kemper Remote, where the rig level is increased/decreased and stored with one of the switches? It appears that the KPA architecture doesn't allow this but I would be interested to know for sure.