I'd love to see support for the
<link rel="publisher" /> tag in the Social options page. According to Google, it's the correct tag to use for linking to a Google+ Page, with
<link rel="author" /> being for Google+ Profiles. It'd be quite useful for cases in which a site has a G+ Page but no author proper (business pages, web stores, hired 3rd party copy writing etc.), as well as for those in which there are both named authors, each with their own individual
<link rel="author" /> linking to their respective G+ Profiles, plus a site-specific G+ Page linked to via a
<link rel="publisher" /> appearing in every page.