Just working on something...
Not really worth documenting yet.
Use turbo mode.
J scroll left
L scroll right
R render (blocking)
If you're at all interested in that kind of thing there's always the see inside button. I haven't commented this much and I've yet to separate most of the controls into procedures but you should be able to figure out how it works. There /is/ ONE helpful comment!
Also I haven't programmed a control yet but there's a delete-all-and-rerender script I left lying around in there somewhere. Shouldn't be too hard to find.