The title pretty much explains my suggestion. Lockettes on doors so you can have a private room to keep from your coop.
Ahem, Adding This would also invole adding Locketts for Chests, which have been requested many times. Just add Locketts in general. Also, There's /jump . Therefor, I Guess I Can Support. :chicken
Well /lockette on doors seems a little silly since a coop member could still break down the walls/floors. Maybe as has been suggested a /protect or /claim for a specific area that you want only you /coop members and players outside to not have access to. So for now neutral.