I can confirm this behavior. After moving all menus into a submenu my screensavers no longer function. They are not listened in the control center applet at all.
-- Moving the System menu breaks the screensaver kcontrol module https://launchpad.net/bugs/46599 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs