It would be great if it were possible to have the workspace "grow" as you add elements to the graph that would make it extend beyond the fixed size of the browser window.
e.g. imagine a graph that's 50 steps long. Right now to do that sort of thing you have to kind of snake it around the page and zoom in and out. If the page could be larger and have scroll bars I think I would call this thing perfect.
This really is an awesome piece of work - thanks so much. I'm seriously considering incorporating it into my project https://github.com/svdasein/thehat