It is possible to cheat in Earth Siege 2. To enable cheating, run es.exe with the argument "-SPRUKNOWN", e.g. run "C:\Sierra\ES2\ES.EXE -SPRUNKNOWN".
Do not attempt to cheat in a quick game. This crashes VSHELL.EXE for unknown reasons.
[ALT] + [LEFT] or [RIGHT] or [UP] or [DOWN] = Warp in this direction left, right, forward or back
[ALT] + [CTRL] + [N] = Nuke one or more nearby enemy
[CTRL] + [N] = Lets you view the combat from different viewpoints, including structures and enemies. Press [ESC] to return
[ALT] + [CTRL] + [S] = Causes several Herc textures to appear
[ALT] + [S] = Freezes the intelligence AI, press again to resume
[ALT] + [the "+" on the numpad] = Steps the game one frame at a time after you have frozen the AI
[Alt] + < or > = Play cockpit announcements and warnings
[Alt] + [Up] or [Down] = Send Herc twelve meters in that direction
[Alt] + [Left] or [Right] = Faces Herc in that direction
[Alt] + [Keypad Plus] = Advance one frame forward when AI disabled