Boarding, got some questions.

[Fierdon]

I just recently started playing PotC and I must say, I'm a bit hooked.. There are things I would like to see in game and things that are done that I haven't seen in any other game of its genre (walking around on your ship, only game i have seen so far that you can do this)

I do know that it is possible to board, but my question is:
Can you only board Flagships?
Or once you get a 'boarding' skill can you board any ship?
And will Boarding be allowed in the SvS when it comes out?

Right now I'm weighing my options between PotC and PotBS, one thing keeping me with PotC is that it is much more casual and I can have friends on my ship.

Thanks for any input.