Add a fire mode to the capital gauss cannon, something similar to a charged cannon. A maximum refire rate of one second and a peak charge to 20,000 damage after say 6 seconds of charging.

When a turret is in the charge mode the bolt could be visible prior to firing. The bolt would sit on top of the turret and grow in size as it becomes charged.

It'd be more interesting for the players. The Captain or whoever is designated to control the NPC gunners has an extra option to play with.

that would be really cool. Ive always thought the cappies could use different weapons.