Be able to control my fleet ships and be able to transfer cargo from ships from my fleet . But your idea in open sea with merchant players of other nation I don't know if it can be in game . I never heard about two ships who's going to trade in the middle of the sea .
BUT FIRST FIX THE DMT LOOTING ... yesterday I was in a battle with AI and I sank him , he was near to me and I wasn't able to him .