The blog I write for has 2 main authors. While this plugin offers the ability to highlight an author for the home page, I would prefer not to highlight one because choosing which author would be a difficult decision.
So under Titles & Metas --> Home I have:
Author Highlighting: Don't Show
However, the home page still has
<!-- This site is optimized with the Yoast WordPress SEO plugin v1.2.3 - http://yoast.com/wordpress/seo/ --> ... <link rel="author" href="X"/> ... <!-- / Yoast WordPress SEO plugin. -->
It looks like the plugin is ignoring the preference.