Ok ive got a complete idea based off peoples opinions, tell me if you like it.
You can either type /lockbrick or /publicbrick and every brick you plant after it is whatever one you chose or typed in. If you wanted to you could even make a Keybind for it (as if we need anymore). And then you can type the opposite to change it. But Everytime you start/join a server its set on lockbrick, or lockbrick is default which everway you think of it. And maybe text pops up saying : Your bricks from now on are locked/public.