Add the following command to your settings.ini in the gamedir,
where 1=enabled & 0=disabled.
For GODMODE simply add
instagib = 1
Unknowns:
goreOverride - Enable/Disable Gore
HUD - Enable/Disable HUD
smartbomb - ?
weakThrax - ?
audio - ?
music - ?
FMVmusic - ?
showFMV - ?
screenText - ?
fullscreen - ?
(c)PiZZADOX