I'm sorry, Mercer. We volunteer our free time here to offer our support to a variety of users and cannot accomodate every request.
Regardless of how you feel, all versions of WordPress are supported and several issues involving post thumbnails have been resolved. All documentation here has been written by volunteers and is open to submissions from everyone. Though there is no completed documentation on post thumbnails at this time, this article may be of assistance:
http://markjaquith.wordpress.com/2009/12/23/new-in-wordpress-2-9-post-thumbnail-images/
I apologize that the volunteers who support this free blogging platform have failed to meet your expectations. We do try our best, but we cannot accomodate everyone.
Back to the matter at hand, this thread concerns the lack of 2.9.2 (the current version) as an available option in the Version pull-down menu when starting a new thread.