is there a tool for creating a river that has width and taper. It would be nice if there was a tool or function where you could draw a line for a river then have a tool where you could specify a starting width and an ending width, that would then draw a wide tapering river from one end to the other and automatically have the ends flair and connect to the shore line if the river enters a lake or connects to the ocean. Even better if you could specify a number of tributaries and their lengths that would be randomly created or if you drew the tributaries they would automatically be drawn wide also.