Right now, a weapon can have only one external model, and if a ship has a bank with a visible model, that's the one it'll use. I'd like the ability to have different models be displayed depending on the ship equipping the weapon. Doesn't need to be automatic. Could just be defined manually in ship table entry.
This would provide a lot of possibilities for, say, fighters with visually appropriate secondary banks (no more trebs firing from a missile rack that clearly can't accommodate them). It would also do things like allow BP's ERA kit to actually add armor plates to fighters.
Basically, it opens up a lot of options for us modelers.