There is no password prompt, and I believe that it kicks admins as well. I'll try to log in as admin next time we travel between maps. Also, it is not a friends only server, and has server takeover disabled.
It seems to be that servers that don't kick the players during match travel will start to do it - every time - as soon as it starts running a game info mod. I still haven't tested it with only a mutator running.
It shows the map loading screen, and then instead of going back into the server, you are returned to the main menu. However, last night I did notice that if you leave the server before map travel, and join back when it still says it's on the old map, but is probably travelling between, you load the new map and enter the server just fine.