I'm building a site for a client. She has about 150 pages in a hierarchy that goes three levels deep. Luckily I found the Page Tree plugin (http://wordpress.org/extend/plugins/page-tree) which is *so* much better to visually manage pages than the default WP view.
But now I'm setting up a hierarchy of categories, and they will go three levels deep as well. Unfortunately, I cannot seem to find the equivalent of the Page Tree plugin for categories. I've searched the WP site and Google extensively. I saw a few plugins that provide "expand/collapse" for categories in the sidebar on a page, but I need this for the *admin* page, not the rendered page the visitor sees.
Does anyone know of something I could use?