I think it would be cool if you could do rope swinging like you see in the Pirate's of the Caribbean movies.
Also how about adding whirlpools or Maelstrom's, something similar to the brethren court, to the game like there is in the movie At World's End.
How about Cursed weapons where you have to do an achievement in order to get it, and also using cursed weapons has consequences like using a fire blade or gun makes you vulnerable to water or something.
How about assigning roles to the crew where you can vote on who's captain of the ship and 1st mate and being captain or 1st mate give's certain abilities.
I'll stop here, idea's keep popping into my head.
Hope you guy's will take some of these suggestion's into consideration.
Happy Thieving & Sailing.
