Cheat Codes
     Make  a  backup of "data\cfg\config.cfg" game file, and then open
it  using  Notepad (or any other text editor). Change any of the lines
as  shown below to enable cheat effects (basically, you need to change
the  last  character  from 0 to 1 to enable an effect), and then start
the game:

set ai_disable 1             Prevents the enemies from moving or attacking
set cg_drawFps 1             Graphical Frames Per Second displayed on-screen
set cg_drawTarget 1          Show information about an enemy or object that 
                             is in your target
set cg_drawWeaponStats 1     Display statistics about your weapon
set developerMenu 1          Enable the Developer Menu items in Options
set god 1                    Enable God mode
set physics_disable 1        Disable the laws of physics
set r_debugVis 1             Show Debug Information about meshes and such
set r_debugVisBox 2          Show debug boxes (like wireframe) on objects
set showNavForPlayer 1       Unknown
set wheelSpeeder 1           Unknown