So far we have Cooldown % and Range %.
Why not add some more weapon modules:
Weapon (some ballistic, some all)
-Ammo modules (+ammo)
-LBX spread modules (much tighter spread)
-Heat modules (lower heat)
-Velocity modules (faster projectiles, PPCs or missiles)
System modules:
-TAG mark (tag lasts a couple seconds longer after the beam leaves the target)
-BAP module (longer range to counter ECM)
Did I miss any good ideas?