Alluding to the Stationary Battleship placement; of course you can't move stationary Battleships, but you can RP a Battleship in the style of a stationary Battleship!
Battleships are more of a deterrent than a pirate hunter. If Battleship pilots behaved more responsibly they could fulfil the job of flashpoint holder. As far as my experience goes, if a trader/miner can get close to a Battleship it is safe from pirate attack, at the very least as an escort to a friendly base or real stationary battleship.