Another idea I had while working today...
Barrage Fire.
The Centauri are famous for mounting large batteries of ion cannons on their capital ships, and these can be fired in massed barrages, saturating a volume of space with so much fire that no ship in the targeted area can evade being hit.
Any Centauri Balvarin, Altarian, Magnus, Elutarian, Dargan, Primus, Secundus, Octurion or Adira class ship can employ its ion cannons or heavy ion cannons in barrage mode. Half the AD of the ion cannon being used. Designate a point in space in arc and range of the weapon. Any ship or fighter within 3" of this point is attacked with the halved AD. The ion cannon loses its twin-linked trait but retains double damage. A heavy ion cannon retains AP. Any dodge or interceptors on the attacked ships or fighters are ignored but any other defensive trait, shields, adaptive armour, etc, still applies. Stealth rolls need not be taken to target an area with this attack. Scout re-rolls may not be used.
Basically, this would improve the Centauri's chances against dodge, interceptor and stealth heavy fleets, but the half AD and loss of re-rolls hits them fairly hard. A Primus would roll 6 dice against a White Star, for instance, so unless it got some ansty criticals the target would likely survive a single attack. The idea is powerful against a few fleets and worthless against the rest. Is it too powerful? I leave that for those wiser than myself to determine.