We've added a new setting (accessible on the Admin > Site Info) page, to allow you to disable the Search Engine Sitemap. By default all our sites are SEO optimized, but in some cases, a client may not want the search engines to index the site (until they are ready). So this option will turn off the sitemap.xml data, which search engines use to provide a map of what pages to index. It will also add a meta tag that tells the search engine to go away for now and not index the site.