I'm sorry if it's been discussed before, but so many pages of threads and search didn't help me on this. I want this done without any plugins or any admin commands, pure scripting if it's possible, starting from a simple server.cfg or autoexec.cfg: at every map change or for at least some maps, a script should run for that map where different settings are applied on that map ONLY. Like if map X comes, air acceleration is changed to 100, but on the next map it's changed back to 10.
Help please

The game is hl2 deathmatch, if it matters to anyone.