Kind of piggybacking off these two ideas:
http://forums.plexapp.com/index.php/topic/51593-send-server-messages/
http://forums.plexapp.com/index.php/topic/73077-control-of-users-with-mac-address/
I would love to be able to set a remote user limit and display a message to users trying to connect saying that the server is full. I am guessing this can be done by displaying a looping h264 video with a custom message? Would love a "whitelist" as well for users (like my parents) who are able to bypass this limit. Who knows, just an idea I had.