[Zope] Javaapplet replacing ZMI navtree?

Look at this for example. http://www.spigots.com/outline.htm Has anybody successfully tried to replace the nav tree in the ZMI with an applet like this. I can see a great use for it. Especially, if you like me do a lot of work on a slow modem connection. This applet can be loaded in once and then you have it there. Alternativly you load the old navtree by default and if you decide to stay in the ZMI for a while, you click to load in the java applet. Or perhaps somebody's managed to successfully replace it with a good little javascript?? Future directions? Peter