It would be useful to have either a max height for the prime pillar or (better yet) be able to turn off the prime pillar after a certain layer or extruder change.
A recent model I printed had only one color/extruder for 90% of the model height above a certain point. It would have wasted more filament in the prime pillar than was actually in the model. As a result I had to turn off the prime pillar and put up with fudged up colors for a couple of layers after the tool change.
