The fx in the Kemper are modelled, not profiled. And you can have only one profiled devices active at a given time. They are two completely different worlds.
I think someone from Kemper said, perhaps a year or two ago, that profiling effect pedals was something they were looking at for the future. But we haven't heard anything since, so who knows.
I know CK doesn't want the KPA to get too complicated, but some sort of "build your own pedal" stomp would be pretty cool - three or four pages of settings to tweak, etc. Alternatively, a PC app that lets you design it, save it to the KPA, and then you just have the usual Drive/Tone/Volume to worry about.
Maybe one day, you can buy Kemper controlled Servo-Motors, put them on the knobs of your amp / stomp and let Kemper not only profile one snapshot, but the whole thing by driving automatically to different combinations of knob-settings 
