Good Points all, I would just like to add that on page 96 of the B5RPGnFB you will see that:
restrictions in the Starfury's fusion reactor output means both sets of weapons may not be fired simultaneously.
Hence the logic, one could unlink the light uni-pulse cannons and fire them at two different targets if they had two base attacks. But one could not unlink all weapons (uni-pulse and light uni-pulse) and make 4 different attacks.
Of course a GM can change this at will . . . Ie: Once, and only in a desprate situation where a shuttle full of explosives was on a collision course with the mothership I allowed a character to manually override safeties and link all his starfuries weapons together doing a single attack roll that fired a bolt from all 4 weapons. I then ruled his reactor was going to blow forcing him to eject. Extra roleplaying drama was added as the day was saved, but at a hefty loss. The pilot was unable to launch in a fighter until the mothership docked back at base and took on supplies.
But again this is only with starfuries. A minbari flyer with a tri-linked weapon would in my mind be able to unlink them and make 3 attacks per round IF the pilot had 3 attacks per round.
Okay, different direction . . .
Rapid Fire = 3 attacks a round, simulates holding the trigger down.
Therefore, in my mind, the machine (light uni-pulse cannon) is only able to cycle so fast. And thus, 4th and 5th attacks are wasted, because the weapon doesn't fire that fast.
Yet, another direction . . .
Lets look at a catapolt. Is it possible to fire it 5 times in 3 seconds? Nope, due to the reload time of the weapon.
Its all a matter of perception,
PsycloneJack