oh god... everything more than 16v16 is not suited for UrT - my opinion even goes to a "normal" 5v5 / 6v6 which is the best.
I do 16 spawns for each team / group ofcourse, to prevent spawn bugs on "normal" 32-slot servers (like in urthd will only be)
I have not seen a single server that supported more than 32 players okay, some don't even do that.
They are laggy, and if the server Admins want to - they put the map on the server, because on tdm (what they play most) some spawn-telefrags are okay.
But as this map is suited for zombies and massive tdm's - I'm okay with that many spawns