About /etc/profile : it should not be needed , the "startkde" script from trinity already adds its own path (/opt/trinity/bin).
Also, if /opt/kde3/bin exists, it means that you have some opensuse-kde3 packages installed, which is not supported yet by Trinity.
You should remove any KDE3-related package prior to running TDE.
About DISPLAYMANAGER: you should simply use:
DISPLAYMANAGER=tdm
and it should work. We need to add this information to the Wiki.
About 11.4 missing packages, I will try again to fresh-install the distribution then TDE 3.5.13.2 to check which package is missing, if there is any.
Francois