A lot of options missing, too overreaching

I was quite happy with the titles set by WordPress and/or the plugins I’m using; this plugin seems to do a worse job at deciding the title, and the behaviour cannot be overridden except with some code (though at least WPSEO_Frontend::$instance is public and can be easily set to a subclass removing the pre_get_document_title filter and calling wp_get_document_title() from title()).

The canonical URL for the homepage is wrong; it should end in a trailing slash (the rest of our permalink structure does not have trailing slashes, but the home/root page does; WordPress itself gets it right).

I would like to be able to restrict the admin meta boxes to either certain user privileges or certain post types.

I would like to be able to control the canonical URL for ‘paged’ pages as I am using an infinite scrolling plugin.

I am sure all this is possible with some code, but for a +1m download plugin just adding a few meta tags I would have expected it to be more out-of-the-box.