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DEBUG ONLY [Not available without FPS counter]
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Num 0    - AI Disabled
Num 1    - Armageddon
Num 2    - God Mode
Num 3    - You are Walking Death
Num 4    - Frame Capture
Num 5    - Render Lights
Num 6    - Missing Texture Simulation
Num 7    - Collision Debug
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Num 8    - Sector Info
Num 9    - Full Sector Info
Num *    - Ranged weapon info [Obsolete]
Num +    - ps3/x360 button prompt switcher
Num -    - default button prompt/back to previous button state
Pause    - Freeze mode
Home     - Version info
L.Alt+R  - Restart current level [2.48+] 
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Special Effects Control [Global] [Triggered between levels] [2.48+]
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Insert   - Fog
Delete   - WeatherSnow
End      - WeatherParticleFog
PageUp   - CinemaFilterGrain
PageDown - CinemaFilterTint
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Note: I didn't change the purpose of these functions (excluding my own).
These functions are related to 'Slayer Engine' build tools.
THEY ARE NOT SUPPOSED TO BE 100% STABLE AND SAFE TO USE.
I strongly recommend to use them only if you can't complete the game.