If you want to change the KDM theme you need to edit kdmrc, the configuration file of KDM.
Iin a terminal type
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sudo kate /etc/kde3/kdm/kdmrc
Search for the word "theme" and you will find a line with "theme to use" or something similar (I'm not in front of my home computer). Replace "Darya", the name of LM's theme, with the one you want. If you are not sure about the name, look into the theme-folder (usr/share/kdm/themes, I think).
I don't know whether this is a bug or whether the name of the theme shouldn't have been put into kdmrc in the first place.