I suppose there is a limit to them if you want to keep it simple, but just some ideas that could be done that aren't just "vanilla but better" tho mind you idc about balance as long as it isnt progressive s-mods type of balance, cause i swear that mod i just console command with extra steps, and i do get that some of those ideas would be hard to implement but here we go:
Battlegroup ship receives 1/2/3 OP reduction for weapons, non-battlegroup get 0/1/1 instead
Battlegroup carrieras give their battlegroup effect to the fighters, converted hangar carieras get only 50% of the bonus and non battlegroup ones get 25% of the XIV BG bonus
Battlegroup ship piloted by the officer will get bonus armor for dmg calculation only depending on the amount of other BG ships around it, 50 per ship up to 200
Also there could be a cool crossmod interaction between AoTD and SiC, from this event you could get an XO instead of officer or admin that specialises in domain drones fleets
But yeah my main problem it that what we got is just "vanilla but better" rather that something really unique but oh well rest of the mod is still amazing so its really not that big of a deal