This file under most circumstances will not need to be altered but it contains source mod specific data that allows the plugin to work much better with games like CSS, HL2 Deathmatch, HL2 Team Deathmatch, HL2 Capture the flag etc.
In the file are a number of templates for existing mods out there and hopefully it should be flexible enough to handle new mods that aren't in there.
If you are interested in added skins to your server for any mod it is worth looking at the file to see how your skin configuration is setup per mod.
******** Warning, if you are using a HL2DM server you should add the new console command :- ma_forcegametype at the end of your server.cfg file. This is because the game changes the game name once mp_teamplay has been initialised. ********