So I took the plunge and installed this plugin on another site and went through the process of 'updating' everything to CEON to create the new url's.
Result is in rebuilding sitemaps the url's are dynamic and not CEON.

During installation Check an error showed up as includes/init_includes/overrides/init_canonical.php was missing - I copied across an unmodified file from a downloaded copy of ZC 1.5.5f then I reinstalled the includes modified core files from the plugin and reran the Installation Check and all was good.

I mention this because the behaviour seems to be that which USU is doing, i.e. not activating canonical, hence sitemap files remain dynamic.

Something is not quite right - so how do I tackle this one? I do not want to lose all the 'updating' time if I can help it.

cheers,
Mike