Zero-G imposes hefty penalties on maneuvers and combat, which can be offset by the Zero-G Maneuvering skill, etc.
Antipersonnel weapons (blasters, laser rifles, etc) can be used to hose down control consoles and similar pieces of equipment. They can do structural damage to vehicles but there are significant size modifiers when using against vehicles and damage caps. The rules for person-vs-vehicle (and vice versa) combat are in HARP SF Xtreme.
Best wishes,
nicholas