F1 - Debug Menu If the settings file have DebugMenu set to true, then the debug menu can be accessed. Here lots of nice stuff can be found. In order for most of the other shortcuts here to work, DebugMenu must be set to true.
DebugMenu
F2- Pause This pauses and unpauses the game.
F3- Fast forward This games the game run for times faster. Good for skipping sections.
F5 - Reload This reloads the current map.
F7 - Spectator Mode Changes to spectator mode, which allows you to fly freely. Constrols are. WASD, Shift, Space and Ctrl.
F8 - ScreenShot This takes a screen shot and puts it in the same folder as the exe file. You can change ScreenShotExt in the settings file to change the format.
F9 - Quick Save Saves a save-game.
F10 - Quick Load Loads a save game.