My mom just asked me if it is possible for her to run her screensaver at the login screen of different accounts.
I can't figure out how to do this or of its even possible.
I was just thinking about this yesterday. I do not think it is possible. I remember I left my Mac at the login window for a few hours a couple of days ago. When I came back, the screensaver had not activated. The display did sleep, however.
I'm not sure about a screensaver, but I do know that if you set the display to sleep at a certain time, it will sleep at that set time during the login window. Could be a good workaround.