I didn't read all messages in this thread, but if capships should be restricted, i can only think of one way;
"Capships (Battleship- and cruisersclass in particular) shouldn't go too far out of their ZoI if they're not escorted by a few fighters". This would at least take care of all the indy capships roaming around sirius looking for an easy fight. BountyHunters don't have a ZoI (afaik), but the caps for those are already getting restricted in 4.85. Zoners can go wherever they want, since they can't/won't/shouldn't attack unless it's in self defence.
The reason why i think a capship shouldn't leave it's ZoI on their own, is that it would be unprotected (A single group of 2 or 3 bombers can take it out without breaking a sweat). An organization wouldn't allow such expensive hardware being so vulnerable (nor would a proper captain).
The "fighters" part is to prevent big caps-only fleets.