This is probably an esoteric use case, but I often start Windowmaker from kdm and had a problem with Thunar not automounting my USB key when it was plugged. This did not occur in Xfce started from kdm or when I started Windowmaker from run level 3 using 'startx'.

I have now edited /usr/share/apps/kdm/sessions/wmaker.desktop and changed the Exec= and TryExec= entries to call the xinitrc.wmaker script in /etc/X11/xinit rather than calling wmaker directly.
This means that dbus-launch is run as a wrapper around Windowmaker with the result that automounting now works.

Does anybody see any problems with this?

Just to move from zero reply list to esoteric thread oblivion.

As no one else has replied: IMO this seems like the correct thing to do. 'xdm' calls the xinitrc scripts, so it makes sense for kdm to do the same.