I had no idea there was a name for that technique, or even that it was a technique. I have a notebook full of scrawled ideas that I keep in my coat pocket all the time. Generally it gets scribbled in while I'm sitting at a bar of an afternoon, or on a bus or a train, or wherever I get an idea. It makes no sense to anybody, not even me anymore sadly, but it is a d@mn useful way of getting your ideas down before they run away from you again.
Don't like the name river of ideas though, I always called it drunken scribbling.
http://www.plasticsquirrel.co.uk for all your bizarre music and musings needs