Cheat Method
In Windows Explorer, go to My Documents, and find the Ancient sSace folder, within a random number folder are 2 ini files. Open PlayerOptions and change cheats = False to True. Then open Keys and assigng some keys to the dev commands:
Bind (GL_DevWindow,F9,0,None,0)
Bind (GL_DevWinMission,RightBracket,2,None,0)
Bind (GL_DevLooseMission,LeftBracket,2,None,0)
Bind (Unit_DevEscort,None,0,None,0)
Bind (Unit_DevJump,J,0,None,0)
Bind (Unit_DevSelfDamage,K,0,None,0)
Bind (Unit_DevSelfRepair,L,0,None,0)
Bind (Unit_DevSelfDamage_Large,K,2,None,2)
Bind (Unit_DevSelfRepair_Large,L,2,None,2)
Replace None with something, like Keypad1, Keypad2 etc. You also have access to the dev window, and can change lots ingame like tech lvl, resources, spawn units, etc.
(supplied by: Ashar)