i don't know if it's a bug, but you can't enable or disable in xml sitemap the custom post type archive.
For example, i create a Type with Types & Views (With WPML)
-> i create custom post types for this type
-> i create an custom post type template archive as archive-my-type.php
I want disable in xml sitemap for this types, all post types but i want to keep the archive type in the xml sitemap
Secondly, i don't find meta keywords for custom post type archive.