I've just put a small mod up onto
www.freespacemods.net (it's pending approval now) under miscellaneous/general called nvsblmnc's rebalance. It's an experiment to add a bit more variety to the FS2 fighters by modifying their weapons capability.
Broadly, I've split the weapons into three categories (light/medium/heavy) and have limited the ship's compatibility based on these divisions. I've also adjusted the firing points on the Erinyes to a 2 / 6 layout that (in my mind) makes more sense given their layout on the model. There's a readme with a list of weapon categories and what each ship can carry.
It's still very WIP, but I'm looking for a bit of feedback as to whether or not it makes your ship choice something of a more tactical decision. If anyone wants to try it, let me know what you think. If the feedback is good I'll develop it to include secondaries as well.