Desktop Enviroments: Lock screen widgets availability

view story

http://askubuntu.com – I use two awesome de for me (MATE and Cinnamon). Also I like KDE but not too much. But this question about not desktops but lock screens. Can anybody answer, is it possible to add widgets (like time/weather/other things) to lock screen? I am suppose that this function already in latest version, but don't know about it. INFO: Now I have MATE 1.6.0 and Cinnamon 1.4.0 (HowTos)