I think normal players should be able to dock on the cruisers. That would be much cooler than making it possible to have NPC fighters that would make the battleship even more powerful than they already are.
I say players that can dock on battleships or nothing.
Anyway, I don't think that in Freelancer it makes no sense to be able to dock on battleship because we can already do it with cruisers that are stations.And I don't meant to lose my times enumerating all ways it could be used for.