I'd like to see a dual and quad mount system implimented.
Dual fixed mount allows mounting of a pair of the next class down weapons, (eg: 2 class 2 guns on a class 3 mount).
Dual gimbal and turret both allow the same, but at 10% and 20% reductions in power respectively, and rail/plasma count as 2 weapons (can only mount one on the gimbal)
Quads work the same way but mount 4 weapons at 2 classes below the mounting frame (eg: 4 class 2 Multicannons on a class 4 mount)
In all cases, there would be a slight stagger to the firing of the weapons on a mount, allowing a ripple fire effect for pulse-firing weapons, and a collective "spool-up" on continuous fire weapons.
Also, missiles and mined have been omitted, but I'd like to see the larger calibers from concept art introduced
Pros= More variety in weapons, especially at higher tiers
Cons= 2 smaller weapons are more power-and-ammo-hungry than one big one, and are less effective against armour.
Dual mount would be too good. 2x Class 2 mounts > 1x Class 3 in general.