I don't have a bunch of well thought out stats, just a random idea.
Impact damage is awesome, and should have the opportunity to be used as a utility. Maybe this wouldn't be the best weapon to use on ships that have very few weapon slots but...
Pellet gun
primary - Impact damage
secondary - ?
Long-Very long range gun, no arming time, projectile based
Shoots small pellets/rubber balls/whatever at the enemy, dealing small quantities of impact damage.
Deals double damage or secondary damage if the enemy ship has a pilot on the helm using piloting tools.
The gun would be an interesting way to knock the arcs of an enemy sniper ship off. Shoot the edge of their ship and turn them so they lose arcs. Shoot a charging pyramidion to slow/turn them. Shoot an enemy pilot who is stressing their ship with piloting tools and watch as your impacts deal extra damage to an already stressed ship.
In the middle of a brawl, knock away the nose of an enemy to get that favorable angle you were looking for.
It wouldn't be about damage, but about stopping the enemy from dealing damage to you.