While in the cockpit (simulation or mission) type the word dynomite. Then press:

CTRL C - Disables collisions
CTRL I - Provides invulnerability
CTRL F12 - Annihilated any targeted object

During flight, enter:

goodtarget - different targeting mode
moretunes - turns on the radio!

If you wanna fly the enemy ship, enter alswantsmoreships at the Simulator Mission Selection screen.