At first I thought it was actually a mod already, until someone asked if I was remembering something from the Bethesda GameJam. I was. (0:40 mark) http://www.youtube.com/watch?feature=player_embedded&v=iJguhBeaDIs How hard do people think it would be to make a mod that did that (the river flowing realistically, rather than what you get at the moment where you have water flowing into/through solid rock, the banks, sand, whatever, and out the other side with no interruption.) The W.A.T.E.R. mod doesn't do this for the majority of the river, although it does improve stuff like rocks in the river. I have no modding knowledge myself, sadly, so any more informed comments would be peachy, hah!