Can I make Getsimple actualize sitemap entries manually?

[shawn_a]

you can use my hook components plugin and add a hook on any front end hook and do a

(add some slug specific checking here or querystring, so the file check does not run constantly)
if(!file_exists( GSROOTPATH .GSSITEMAPFILE)) generate_sitemap();

Then delete sitemap and visit front end ( assuming plugins are that use sitemap filter and hooks are still running on frontend also) it should work.