Looks like the widget, i was looking for since a long time. But I have an seriourly issue with that:
When I open the my page, everything looks fine with the navigation. When i click on an entry, which contains sub-entrys, the collapsing sub-entry will overlap with the existing level-1-entrys.
My test-site: On hmia.yourweb.de
WP 3.3 and 3.4 = same issue.
It would be really nice to get a tipp, how to solve this :)