Why would you want to login to KDE as root? It is really dangerous to do that because if someone hacks into your system, they can do a lot of irreversible damage. You can do any system administration work as a normal user. I haven't used Suse 9.2 yet, but Suse Enterprise Server behaves in the way that you mentioned because root is only supposed to login just to do quick administration work, but not run a full gui environment like KDE.
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