How 'bout this: we ditch the retarded "split into n shots" mechanic and instead make it actually somewhat useful AoE-oriented weapon combo?
It's SPACE, for crying out loud. Even 1° over large distances causes mind-boggling inaccuracy, that scattershot ain't hitting jack.
So the revised combinations would be:
Cannon: a nice dense orb of plasma or any other dangerous substance.
It starts out dense and damaging but dissipates over distance, growing bigger but weaker. On the flipside it's piss-easy to hit
anything with that kind of projectile. Plus it adds a more than a generous amount of damage, which dissipation effortlessly balances out. Less punch-through, more innate explosion.
Hope you like bullet hell.
Beam: flamethrowers are so old school. High-power energy armaments are all the rage these days.
Turning lasers into floodlights might not sound like a top-notch idea but what if they could adjust the cone width to the optimal frying intensity (read: damage) you calibrated them to?
Cut a perfect round hole through other guy's ship. You know you want to.
Pulse: because there should be at least one good reason to use Pulse as primary.
Fires an expanding wave. Like any self-respecting blastwave it grows weaker over distance, but boy oh boy does it hit
everything in it's path of destruction.
Despite it being Pulse, the range is actually pretty decent. Just don't expect to deal significant damage at such distances.
Missiles can stay the same, except they're now lock-on and even more missiles are fired. Great for overwhelming PDs.