By editing the valuse in this txt you can change:
DirectSound
LightMap
Gore
SPRadar
Reality
CrosshairAlpha
CrosshairRed
CrosshairGreen
CrosshairBlue
CrosshairDynamic
UseCrosshair
CrosshairStyle
Subtitles
FadeBodies
HUDLayout
MessageDur
HeadBob
Difficulty
AlwaysRun
WeaponSway
AutoWeaponSwitch
LoadScreenTips
VehicleContour
and i think you can put tracers on.