Okay, same difference. Who determines the "proper" use of a Capship? Technically, the Admins/dev team should be the ONLY ones making that decision. Not some small sub-section of the community.
You may not like it that a Zoner group has decided to use their Juggernauts/Nephilims/whatever to spearhead some kind of assault/defense, but that should be their decision on how to use their capship, not yours.
Here's a thought - instead of just restricting BS by ID or via special permission of a faction/group - why don't you just increase the cost of purchase for BSs and all BS-relative weapons and equipment?
Then....the most dedicated who actually get them are going to be the people who will put in the time/effort to earn the money via trading, mining, etc. (which gives pirates, escorts, etc. more things to do, increasing server activity altogether).
This seems more of a positive reinforcement for earning caps than simply restricting them.
Or...maybe make them build-able from PoBs? There's an idea...