I think this would be really handy
6 new MIDI assignment areas which appear in map mode, on a Sampler or on a Rack
For the currently selected sample or chain:
1) adjust lower limit of zone key
2) adjust upper limit of zone key
3) move entire key zone (without changing it's size)
4) adjust lower limit of zone fade
5) adjust upper limit of zone fade
6) adjust root key
Then you can dial everything in without your mouse
Possibly there could be a way to have the zone editor be considered a separate device in terms of Instant Mapping / Automap, so that your controller could take on these assignments just by putting focus on the zone editor (?)