Ok guys, more info on what the config file actually does. (may be worth admins typing: rcon exec superversus.config when they start a game. It should be running already, but just in case.)
1) 8 vs 8 versus mode. Could have up to 18 players really, but 16 is enough strain for the server methinks.
2) Extra Infected. More zombies should spawn and it has even been rigged so that you should get extra tanks/witches. One possible bug from this is also reduced spawn times for infected, but we'll see.
3) Difficulty locked to advanced. With 8 survivors it would otherwise be too easy I think. We'll see what this does. Can be changed at a later date...
4) Steamgroup/IP connect Only.
5) No voting please. The options may screw up the server. If you would like a different versus map, ask an ingame admin to change it.
6) Cevo changes such as guranteed tanks and witches and lack of medpacks are all in this config.
Hope it works. Enjoy
Also, the search key is the method that you choose which server to connect to from lobby. Not available for this 16 man server.