I have the SiteTree Plugin: http://wordpress.org/extend/plugins/sitetree/
SiteTree is a lightweight and user-friendly tool that lets you add to your WordPress site a human-readable Google Sitemap for search engines and/or a customisable Archive Page (or HTML5 Compliant Sitemap) for your visitors in no time.
Unfortunately I cannot tell if or how I Could CodePress Admin Columns might work with Site Tree.
I opened the settings for CodePress Admin Columns and looked for anything like Site Tree, including Custom Fields but I couldnt find anything :(
It would GREAT to be able to i.e. exclude posts from HTML5 / Google Sitemaps as well as set the priorities from the Posts Admin Dashboard
I will also post this feature request over at Site Tree Plugin page.