When I edit a boundary (filled region, masking region, plan region, slab), my API is disabled entirely. It would be nice to be able to use addins to do things standard Revit does not do, such as chamfer corners (you can fillet a corner, delete the curve and connect the ends -- which is unnecessary effort). What I don't understand is why ALL my addins are disabled. I can understand that SOME might be incompatible (such as adding a family symbol), but not ALL.
Another part of the idea is for Revit to provide chamfering on the Modify tab.
