Forklift option
Hold [Option] and click on the title screen until the Escape Velocity/ Mystery Science Theatre theme song plays. Hold [Ctrl] + [Command] + [Option] + F when the phrase "-MCB 4:35 A.M." appears.
(Note: The "Forklift" theme song confirms correct entry. And will appear within the secondary weapons list.)

Burglarize spacecraft while its crew fends off an enemy
Hover around Azdgari and Igazara warships while they are embroiled in battle. When the victor becomes apparent, climb aboard the defeated vessel (before it is destroyed) and take its money.