>a ship system that takes away flux from an allyIs it just me or does this sound like a reverse-aerial-refuel?
https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/KC-135_refuels_an_F-16_Fighting_Falcon.jpg/1280px-KC-135_refuels_an_F-16_Fighting_Falcon.jpgA physically attached hose of sorts could take away waste heat (aka flux) from a ship to be vented by the supporting ship. Might be annoying to code in a (flexing?!) hose though.
>some kind of healing beam (has been tried before in other mods, finicky and tough to balance)I don't like space magic stuff, drones would be better imo. Either that, or this "healing beam" could just be sealing foam of sorts, repairing hull damage but reducing speed and turret rotation. Enough to keep the ship in the fight a bit longer/let it safely reteat, but not much more.
Overall I like the "support ships" niche a lot.