Start the game with the -TestMode command line parameter to activate Cheat Mode. A quick way to do this is to right-click on the desktop shortcut and select "Properties." Click on the "Shortcut" tab, and go to the very end of the shortcut path. OUTSIDE the quote marks enter a space, and then enter -TestMode. Use this shortcut to enter the game.
In the game, the "Quick Battle" button is replaced with "Test Only." Click this to go to any level in the game.
During gameplay, go to tactical display mode and enter the following:
Shift-G -> God Mode
Shift-R -> Completely repair target
Shift-Q -> Gain 10 Quantum Torpedoes
Shift-K -> Damage targeted subsystem by 25%