I like what An'shur the pink nomnom brought up with the naval guns. Maybe the Cerberus cannons should be reworked to ammo-based Battleship Cannonballs.
As for the fixing the cerbs without changing them to something else entirely, I haven't been flying battleships as of late, but I have seen many loadouts change because of the change to the Cerberus turret, as well as a decrease in BS sightings. Instead I see more BCs and HM-spam BS... if I see battleships at all that day.
I'd move that two things happen: Cerbs are mediated to a point of original stats and current stats (to satisfy people's needs to Cerb things while keeping them balanced and a decent long range weapon) and a new 'pseudo-Cerb' made that operates as a large, ammo-based cannon, somewhat similar to a Mortar and HM but without the spam of mortars.
Also yes, cerbs are great for snubs. They 2-hit and are more efficient than Razors... plus you can use them against the Battleship you just forgot about to shoot that snub.