Ooo, that's nice to know. Maybe I should host up some custom maps that's easy to play through for pubs sometimes. I do feel a bit sorry having to kick (well its my friend who mostly boot people off our room) when direct IP for us fail so we do the host public but put a "FRIEND's ONLY" title. Well I do, they're quite lazy to do it. Some exposure would be nice.
I do wonder what happen if the custom map may go up to about 70 MB or something like Requiem for Hammerwatch.