I was thinking it would be cool if navies could operate in the major rivers of the world. I am biased, because I have always lived so close to the Mississippi river. I think it would be cool to have your armie zip up the Missisippi and unload in the interior of North America. It would only be practical to have this with a very select number of rivers. Mississippi and Nile seem like 2 very good and useful ones. This would also add a lot of strategic advantages to owning say the port of New Orleans, wich seems to be historically accurate. Anyway, just a thought i had, what do you guys think?