Alt-Tabbing..

[nki1]

There is still one biiig issue with alt tabbing out of the game. The brightness changes back.
As you stated you're doing some stuff when swichting out of the game and back, so you should just reload the brightness from config there too.
Also a brightness alias would be nice.

[free]

What is a 'brightness alias'? Can't you just use mat_monitorgamma?

[nki1]

The mat_monitorgamma command isn't always working for me. Sometimes you alt tab and back and then it doesn't work.