how to REALLY change logon screen saver timeout time

I've repeatedly tried to change my logon screen saver timeout time via

Start | Run regedt32 | HKEY_USERS\.DEFAULT\Control Panel\Desktop\ScreenSaveTimeOut

but although it faithfully stores the number of seconds I want, it keeps actually timing out after 10 minutes no matter what. It wouldn't matter otherwise, but having more than one user accounts necessitates reentering the password for the desired account as if you weren't even already logged in. So how do I make this really work?

 

Have you tried changing the time from the Screen Saver menu at Personalize, Screen Saver. You have the option to chose up to 9,999 minutes. And you can choose to have a password required when screen resumes, or not.