Indeed, it does. Although I have found the registry-hack method described in that post you linked to be unreliable (The system would often reset the reg value in question for no adequately explained reason).
To enable it permanently, create the folder %windir%\system32\oobe\info\backgrounds, and put the background image you would like to see in there, as per the post's instructions (Remember, it has to be a jpg, smaller than 256 kb.). Then open the Start-Menu, type "gpedit.msc" in the search field and press enter. This will open the group policy editor.
Navigate to "Computer Configuration->System->Logon". Double-click on "Always use custom background", and change it from "Not configured" to "Enabled".
