Automattic/Co-Authors-Plus — pull request #11 by danielbachhuber (2014-02-01 12:31:15+00:00)
Title: Allow editing co-authors from Quick Edit

Co-Authors Plus v2.6.1 and before removes the ability to change the post author from the Quick Edit interface. It would be great if we could add it back.

Requested in the WordPress.org forums: http://wordpress.org/support/topic/plugin-co-authors-plus-plugin-clash-with-admin-management-xtended