@_cDub
It actually can be scaled in width at each spline point individually. So you can have some very wide parts of a river and some much thinner parts on the same spline. You can also customize the tiling of the Textures both vertically and horizontally on each spline. So if you need different tiling i would recommend making a small waterfall and then branching off from there and creating a new spline where you set the tiling differently. I hope that helps! 