Type 'debugon' while playing to enable debug mode. In this mode 
dinosaurs will ignore your presence untill you shoot. Also you 
have unlimited ammo in debug mode and lava does not kill you.

Code                           Result
CTRL                           Run Faster
SHIFT+S                     Slow Motion
CTRL+N                      Long Jumps
SHIFT+T                     Show Frame Rate
TAB                           Full Map