With a WPCMS site, some pages are "special" pages - order return pages and error pages for example - which you might not want included in a sitemap. Likewise, some sites have a page which has a lot of additional content based on the variables supplied (an example of this is the Dog and Lemon Guide's Japanese Vehicle Recall database, which lists recalls affecting 46,000,000 vehicles from 21 car companies).
We've been using a spare WordPress installation (via Postie) to trac job comments that aren't in Trac, and a Lilina installation to correlate and aggregate all the RSS feeds together. The mashed tools together work really, really well - Mummy, is this Web2.0? - but a misconfigured mail filter resulted in about 400 duplicate posts on the WordPress install, which didn't help.
I think, with some careful HTML you could get away with not using this plugin at all.
But, if you want a version of wp_list_cats() or list_cats() that works fine inside an ADxMenu, without having to hack your main WordPress code, then you might like this plugin ... it adds the functions adx_wp_list_cats() and adx_list_cats(), which are almost functionally identical but don't make ADxMenu misbehave.