navigation component -- allow dragging sub-nav items to top level, and vice-versa.

It would be sweet if we could drag navigation items around between navigation ‘levels’, not just sort them in their own list.

Yup.  That would be sweet.  But I think they are completely distinct items right now and moving a child to a main nav element would require a complete transformation of the XML.  Not impossible,  but not just adding the “draggable” tag to the element.