If the player is listening to you, then you'll have told them which gun to man anyways, and they won't make the mistake at all. No problem there. If they don't listen to you because they're trolling, then they don't get the opportunity to steal a gun. From what I've seen, manning the wrong gun is one of the biggest examples of trolling in this game. So while not all trolling would be fixed, it would take away one of the bigger problems. I mean, if you want to use the "trolls will always troll" argument, we might as well remove the feature that lets captains kick other people off the helm.