Freelancer and Mercenary ID should only allow the use of Gunboats and lower. Mercs and Freelancers wont have enough money to own them, and when you think about it, those big capships need a crew of upwards of 400 people. Doesn;t really seam freelancer-ish to me if you have a captain and then a big generic crew and you still a freelancer.
I think that this would limit the number of capships in use, GUnboats should be the biggest.
And Unless a faction is a big one, it should not have ANY m,ore then 1 or two. You have the fleet leader, and only he would be privilaged to use a BS. The reason is being, he has large control and logistics rooms on that ship for managing his fleet and if there were 4 battleships, it would be a logistics nightmare.