Finally i figured out how to compile and patch qstat. I'm working with the trunk version at the moment which can query Cube2 and Teeworlds servers. I plan to file a wishlist bug to the Debian BTS as soon as my qstat package is in a acceptable state to save the maintainer some time (hopefully).
The good thing is, with qstat 2.12 i can make Munin display new Sauerbraten and Teeworlds graphs, when and how many gamers play on the server. But see for yourself.