Originally Posted by
derpderp
Its a dvar. Usually these things would be editable in game right through the console, but IW locked the console in game though.
Editing the config_mp is the next best thing, and even when you edited things in the console in game (like coD4) it would just be editing the config_mp anyways. There are commands that you can edit in the config that you cant get to in the in game menus too. Its all legal and wont get you banned. Try looking at the MW2config tool. Its a program that edits your config_mp with a lot of cool stuff. Like more than 4 bars, or different bar colors etc etc.