Add Tag-Pages to Sitemap?

Wouldn't it make sense to also add the tag-pages to the sitemap plugin? e.g. http://getgrav.org/blog/tag:dropbox ? I tried to modify sitemap.xml.twig on my own without success.

Those are dynamic queries rather than pages. Those pages are already listed under blog/ anyway. I'm not sure there's any benefit to them being in the sitemap.

I'm not a sitemap-expert but I guess it would make sense because then google & co. could index above mentioned dropbox-'Page' and so if someone searches for 'grav' and 'dropbox' they could find the overview page immediately. But I'm not an expert for sitemap (or SEO) so not sure whether it's recommended. I've tried to do it on my own, copying the function from taxonomoy-list but I could not get it to work.
Maybe sitemap-plugin could get an option 'include tags' ?

You can add it as a feature request in the project:

https://github.com/getgrav/grav-plugin-sitemap/issues