[jimbob]

The ability to make tradeable components!! Then instead of buying the whole ship, you can just sell (or buy) individual components and plop 'em onto your ready built ship.

A mount that makes an object self-destruct. So when the enemy tries to analize your ship, that particular object destroys itself (but not the ship) = non-analizable components. Maybe even the object self-destructs if the ship is boarded?

Derelicts that can be taken over by the first player to attack it with boarding parties. The player can then scrap/use/analize the ship gained... would be particularily interesting if there were colonists on board in "suspended animation"!!