I'm pretty sure that it's everybody's wish to add naval warfare system in the game, as I do
However, if the current game engine is not suitable at all to install naval system, it would be a useless request or hope to dream such dramatic change in game.
Since I am not really familiar with modding, I have no idea whether it is possible to add naval warfare in the current engine or not. If it's possible, even if the dev. team do not publish a DLC that adds the naval warfare, still there is a huge chance for seasoned mod developers to add the content.
So what do you think?