Old complaint, but I still say it every time I fly a shuttle, "this thing should have a rear auxiliary arc." even if it had been a guns 1 thing. Or if you had to spend the e points for anti pursuit lasers to use them. Or you could equip your cannon slot as the tail gun. Anything.
I feel you there, it's too bad aux/out-of-arc shots are just primary instead of primary minus 1.
How about no, and just... stop.
Especially for Auxiliary arc as they can still be dodged (unless you are incompetent). The only advantage Auxilary arcs have over 360 primary weapon turrets is that they have a large arc for things like Outmaneuver and tactician. You must really hat flying against firesprays. You must seriously hate boba fet if you want to drop the rear shots to 2 firepower.
They'd need to come with some cardboard tokens for the pilots, with a printed secondary firing arc on them.
They could go imaginative and release a generic large ship upgrade with, I don't know, the Punishing One when it comes out, that is like
Rear Fire Cannons
Large ship only. Cost 3.
You cannot equip this upgrade if you already have an auxiliary firing arc, already can attack out of your firing arc, or your agility score is higher than 1.
Your pilot token may have a rear fire arc overlay.
And then the rear fire arc overlay is a transparent plastic square with a rear firing arc printed on it, to be put on top of a large ship pilot token.
As someone who is trying to use overlays (for my Scum CR-90 conversion kit) I can tell you that they are not the most stable of things. You are better off gluing or taping that overlay down or having a whole new cardboard tile.
Probably why FFG didn't but differing stat values on their ships. Sure the APL doesn't come close to having a firing arc even if it was only 1 firepower and the rear firepower is much weaker than forward firepower. In order to give a shuttle an auxilary firing arc in any piratical purposes They would have had to make a pilot with a Firepower of 2 and printed ability is "your ship has a rear auxiliary firing arc." I guess they could have gotten a little more colluded and make it firepower 1 with the ability "you ship has a rear auxiliary firing arc. When making a primary weapon attack inside your primary firing arc add 2 firepower."
Still when FFG designed the shuttles they were not going for a combative ship but instead more of a support ship, much the same when they gave the HWK-290 1 firepower. It wasn't supposed to be an attack ship but more of one that helps your ships attack the opponent faster.
