But battleships in space are only very, very distantly related to sea-based battleships. A real battleship can be taken out by being rammed by a single plane. If battleships are being constructed in the Freelancer-future, then there must be a reason, but there currently isn't one. 400+ million credits and hundreds of crewmen for a ship that a single pilot can destroy? Makes no sense. What would they be used to bombard, anyway? Bases? Planets? Don't need a battleship for that.
But you can't increase the power of a battleship without restricting them somehow, such as limiting them to factions-only. Otherwise capwhoring would be even more of a problem. They should be more powerful, but they also should be rather rare. You don't use battleships to hunt pirates or escort traders, you use them to defend planets and fight wars.