The game.cfg is no longer generated by the new Half-Life engine,
but XDM can do this for you if you set sv_generategamecfg to 1.

 - Values will be saved from settings.scr.
 - Config is generated each time a map is started.
 - Don't forget to turn it off! game.cfg may override your future settings!

Be prepared for unforeseen consequences!

WARNING: "maxplayers" seems to be "0" during the save process!