At the main control scren press Ctrl and F1 and enter the code you want and press enter. If you did it right you will hear a 'DING'.
Type "Mother Mourn Us" in the cheat code box to make a mountain in Mission 1-5 tune into Mt. Rushmore using the programers faces.
Type "Swiss Throat" in the cheat code box and it changes the Citadel building in mission 2-6 to 7th Level Headquarters and inside are the pictures of the programers. Hit TAB to cycle through them.
Pick a Ship
If you use a gashr on any occupied ship, the pilot will come out. If you go into its ship, it's yours.