It is a kcontrol entry to configure kdmtheme. Handy! If I'm thinking correctly, it should provide 'System Adminstration -> KDM Theme Manager'
I installed the package and everything works, but not until I edited the tdmrc file.
I suspect the problem is here:
[X-*-Core] AllowNullPasswd=false AllowRootLogin=true AllowShutdown=Root AutoReLogin=false ClientLogFile=.xsession-errors-%s Reset=/etc/trinity/tdm/Xreset Session=/etc/trinity/tdm/Xsession Setup=/etc/trinity/tdm/Xsetup Startup=/etc/trinity/tdm/Xstartup
The default tdmrc had file paths of /opt/trinity/share/config/tdm. After I changed them to the way my system works, then the tdmtheme module worked correctly.
Change those four paths to where your tdm config files are installed.
Darrell