The game has a debug camera which the developer uses to view around the different actors in the scene from his desktop. These are the controls for it.

Insert - Enables/Disables

[ - Moves back an actor in the list

] - Moves forward an actor in the list

. - Speeds up time (0.1,0.25,0.5,1,2,4) (Single Player Only)

, - Slows down time (0.1,0.25,0.5,1,2,4) (Single Player Only)

/ - Sets the time scale to 1

Tab - Enables/Disables Gun shooting from mouse

Left Shift + Scroll - Changes FOV

h - Enables Head debug (Doesn't seem to work)

v - Switches camera mode from free to chase and vice versa

t - Does something called tgtMode (Doesn't seem to do anything)

RightShift + A - Changes something to do with Exterior Audio