I suggest that apps running as root while the user is logged into the session as non-root should have a red x - like the "run as root - KDE su" password dialog - as their window icon (top left corner) instead of their own icons. I am not sure if this could be easily done, I think it can not. But you can change color scheme under root, or change icon-pack. So you can make root KDE apps look like really distinguishable
-- Pavel Nemec package-maintainer --------------------------------------------------------------------- SuSE CR, s.r.o. e-mail: pnemec@suse.cz Drahobejlova 27 tel:+420 2 9654 2373 190 00 Praha 9 fax:+420 2 9654 2374 Ceska republika http://www.suse.cz