[theY4Kman]

SRCDS does do it, but it has one huge fault. If your map config changes mp_friendlyfire to 1, but your server.cfg doesn't change mp_friendlyfire at all, friendly fire will remain on when you change to that map. Perhaps you could read from the map config file before it is executed, and store all the default values of the cvars it will change. Then, when the map changes, it restores those values.