Hi Ryan,
There’s a very simple problem with this plugin in WordPress 2.7.
In the administrative panel, the format is now a bit more narrow. Consequently, the advanced options display all the way to the right, way outside of the visible range of the page. (On my monitor anyway.) This makes it very difficult to edit custom menu items, since I can’t see what I’m typing. I just checked and apparently this is only a problem in Firefox, but it might make the plugin look a bit broken to those who are newly downloading it.
You will probably want to alter the admin interface to display these options below menu contents and above installation, instead of next to menu contents.