One thing I don't much like about beam combat is that the optimal tactics are to focus down one ship after another.
On a practical level it adds to micromanagement in fleet battles (constantly reassigning fire controls, while having to calculate how many to assign to a target to kill but not overkill). And it kind of just doesn't feel right - even if its arguably realistic, I want fleet engagements to be more of a naval battleship engagement where ships engage each other all along the line.
As I understand combat between dreadnaught and later twentieth century battleships (which admittedly comes entirely from watching Drachinifel on YouTube...), there are a couple of reasons why fleets didn't focus fire individual ships down despite having the range to do so, which could probably be modelled in Aurora, if desired.
Firstly a ship that was not receiving incoming fire itself was free to lay its own guns without distraction, and would shoot more accurately. So leaving a major enemy combatant unengaged was something to be avoided. A non-stacking accuracy penalty for any ship that has taken more than a certain amount of damage could model that. The damage threshold would need to be high enough that it couldn't be cheesed by plinking - maybe a ratio to the ship's size.
Secondly was ships tracking their own hits by looking for the fall of their own shots to adjust their guns - more than one ship firing on a target made it much harder to do. This doesn't make a great deal of sense in an Aurora context, but could be handwaved (confusion caused by multiple fire control returns or something). Mechanically, each additional attacker on a single target could create an accuracy penalty for all attackers. This could be set at a level where it is low enough that it is still well worth engaging with additional ships if you have them, but high enough that there is an incentive to attack an unengaged target if one is available. And probably capped, so there is no further penalty for more than, say, 3 attackers so as not to cripple swarms of small craft.
With rules like that, a fleet engagement would be much more each ship picking a target (auto-assignment would work really well too..) and blasting at it. It would feel much more like a slugfest, and many ships would accumulate damage. Rather than just ending a fleet engagement with one damaged ship, and all the rest either destroyed or pristine.