When you use this river, depending on what option you've selected last, it will change what it looks like, will the surface be water? invisible? even a ground? what will the banks look like. The banks though, mimic other water bodies.
If you do anything at all the surfaces of all bodies of Random River will change to what the last one was. This may defeat the some of the purpose, even screenshots, testing, or putting objects in it will change it.
This isn't the most useful thing but it's fun to screw around with.
If you want to use this in titans just add the last line to your water bodies.