It would be very handy to be able to blacklist areas by location. Ideally in my mind it would:

1. Take X Y and Range parameters Example: /nav blacklist 25 50 100 ...to not go within 100 units of 25 50.
2. Calculate the path to just avoid the area and error if it cannot, as if the mesh in that radius had been deleted.

Maybe optionally automatically exit the area if it finds itself there.

My reasoning for this request is lets say a named spawns at 25 50, and I set my macro to not pull that mob as it will kill me. nav could still make me walk right through it on the way to a bat. If I were to blacklist a 50 range radius around that NPCs loc, I would have no such problem.

Editing the navmesh permanently is less viable as the named could spawn somewhere else, and that is a lot of work to go through for something that could change frequently.