Currently, the app appears to only allow deletion of *all* no-go zones on a plan. It would be nice to be able to delete them selectively. 

Thinking ahead, this seems as if it will be a more important issue with the mower, since there's a spot on my yard that is going to need some re-seeding, and I'd like to be able to avoid just that area and only for a while, and not have to re-map the permanent no-go zones because everything gets deleted together. Another option would be to have the cameras recognize some standardized thing to avoid (like yellow surveyor flags or something) so that you can create a temporary no-go zone.