Would there be other takers who would like to see an option to limit the number of nodes added to the sitemap by adding a configuration option like "Limit to recent N days"

This would be useful for large sites and where you want frequent updates to the sitemap (Eg: #760396: 404 page not found errors on accessing certain sitemap pages) and you don't want to get 404s from Google.

@Dave - Can this be done by clearing up the xmlsitemap table in a cron hook of nodes older than N days and modifying the xmlsitemap_node cron to not fill it again with older nodes?