Currently, there is one option, to set stomp A and B in a parallel path, mainly for bass.
However, especially with external effects in the parallel path (e.g. Boss SY-200), there would also be many more possible options.
Why not offer these two options:
1. Which stomps are in parallel path
none, A, AB, ABC, ABCD
2. Where does the parallel return before
output, REV, DLY, X, stack
1 would allow to assign different number of stomps, which has been asked before. 2 would allow to reuse post effects for free for both paths.
I guess this would offer maximum flexibility (what Kemper is always longing for) maintaining easy understandibility.
I do see lots of possible usages for the parallel path.