You should add the possibility to connect even when a server is full for players that have been granted with admin/gm right. So they can get in the server quickly even if it is full whether it is to do their admin job when we have a request for in-game problem or to help the GM reconnect when their game crashed and the server is full when they try to reconnect.

So there should be a server parameter to to configure X special slots that allow the max basic player count to be exceeded.
Or maybe to help understand it visually for us, every gm/admin slot is listed separatly between bracket to differentiate basic slots and admin/gm slots in the server browser.