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This extension has very poor programming, almost no styling and awful support. A lot of bugs, some of which weren't fixed even a year after report. I'm glad I became a better programmer myself since, so I fixed those bugs. But this is not a good sign for initial developer.
I really don't understand, why blocking certain domains still not included in Joomla's distribution package. So thank you for filling this hole. Pretty much appreciate that.
XMap is really nice sitemap mod - the only one that worked for me. It's really fast and easy to install, but it lacks a couple features. One is ability to exclude particular menu items from menu. And the second is pinging the search engines after sitemap is generated. Other stuff is quite good.