Love this plug-in, have used it on many sites.
I've just come across what may be a bug. In templates, is_category() seems to be returning false when it should be returning true.
Going to muck around and see if I can narrow it down...
ps. The "elevation" also may be applying to category_description(), so that sub-categories' descriptions are appearing on the parent's page. (Haven't totally suss'd that out, tho.)