Helo, some problems here, looking for solution:
1) I'm using SitemapXML (formerly "Google Sitemap"), because I need more control on my sitemaps (I'm modifiyng the plugin to obtain a set of sitemaps for each language (not sure if it's useful, nobody can say, but for sure is a must for me since we're activating many languages and it is a long process and I cannot submit sitemaps for languages not completed). The problem is that the urls on my sitemaps aren't rewritten. Any hint on how to obtain the rewriting also for sitemaps?
2) There are problems in google webmaster toolbar regarding title duplication of some kind of pages: page with reviews, single page of each review and pages created by the pagination system, for example when a category contains many products (example, 90 products in category AAA, showed 9 each page, we have 9 pages with duplicated title for category AAA).
3) The solution for multilanguage ezpages is very easy (zencart-ez-pages-don-t-get-the-magic-274.html#p2182) and there's no reason for you to refuse to apply it. It doesn't hurt Zen Cart versions without multilanguage ezpages an solve the problems of people using multilanguae ezpages (well, the rest of the world where english is not the main language...).
If these problems aren't addressed, since your software is closed and doesn't allow me to solve the problems it causes, I'd be forced to abandon it.
Of course, since I am co-mantainer of Zen Cart Italy and technical reference, to give best support to the members of italian community I'll must suggest not to use this software since it doesn't work properly and no-one apart the developers may modify it and they refuse to!
Of course, I'll give a voice also to my german, french and spanish friends.
By the way, now there's an open source solution, so if you cannot solve our problems, the way is just one.