Heavy Mine Launcher, except, instead of mines, it deploys small pea-shooter guns.
Pea-shooter guns would be short-ranged and weak. As weak as mortars on practice ships.
Max Deployment 2
or
Max Deployment 5 with slow reload and limited duration (Balance purposes).
Ammo type effects the pea-shooter. For example, lesmok would increase peashooter range, but reduce clip size and reaction (rotation) speed.
Three Tactics/Builds I can think of.
Fish that deploys these going in. Engages with broadside with the aid of pea-shooters.
Galleon that puts these on the starboard side. With correct piloting and aiming, a devastating ship that utilizes all four of its heavy guns.
A support Spire that performs tactically on Cap point maps.
If implemented, plenty of balance to do. Still, a fun idea nonetheless.
Should work kinda like Hydra Sorc in Diablo II, where longer she was in the engagement, more damage she dealt (with Spammed hydras and firewall). Come to think of it... never was a popular build.