Part of the skill in a line battle is situational awareness. You need to be able to shoot, maneuver, watch the ship in front of you, communicate with the ship behind you and so on. Yes, in real life you had someone do that for you, but the only way to keep the game skillful is to leave this to the player themselves. Otherwise we take another element out leading us toward a point and click game with less skill.
To simulate what you want they should have designed the game around a player crew. 1 player steers the ship, other players man the guns, others repair the ship, others check the rum stores...
I respect your opinion but I feel the very things that set this game apart from other age of sail games (yard and sail control, realistic ballistics, unique aiming system, and physics) is what many people are trying to take out of the game.