Custom user login screen in FC4

1. edit /etc/sysconfig/desktop

2. add the line - DISPLAYMANAGER="KDE"

3. edit /etc/kde/kdm/kdmrc
change the line 'UseTheme=true' to 'UseTheme=false'

4. Search for the line 'AllowRootLogin=false'
change 'false' to 'true'
Note: the above mentioned line will appear twice in the file. edit both the lines.

5. Reboot and login to KDE as root

6. Click k-menu -> control center. click on system administration in the control center window. select login manager.

7. Here you are! change the appearance, font and background as per your wish. Logout and see your custom login screen. Njoy ;)