Star Wars Jedi Knight II: Jedi Outcast
Open the file: \Jedi Knight 2\GameData\base\jk2config.cfg
add this line to the file:
bind h "cg_drawHUD 0"
This will bind the disable hud function to the "h" key. Replace the "h" key with whatever you want. You need to bind it to a key because the value will reset with each load and must be reapplied each time. The disable hud function works correctly and won't screw up temporary weapon or item selection displays.