1.x series answer basic needs of meta tags management: keywords and description, and only for pages that are entity displays (nodes, users, taxonomy terms).
Target of 2.x development is extension of module capabilities, in 2 directions.
1. metatags_quick 2.x will support all drupal pages, including aggregate ones like views, panels etc.
2. metatags_quick 2.x will support more head element types, like rel nofollow, noindex and so on
initial code for additions in this branch was made by @john.oltman