You might want to add some basic instructions somewhere too. I had to dig through the source to figure out what some of the keyboard and tool tricks are. Perhaps they are standard in Illustrator or some other tool, but double clicking, shift-clicking, option/alt-clicking, nudging etc... I only figured out by poking around the .js.
You should add a link to the demo in the word "demo" for the people like me that can't follow instructions :). I tried to drag the points in the screenshot instead of clicking it.