Thanks for the tip.
However I do not see how mode 2 would help me either.
I tried it and the only thing it seems to do is write VIRTUALDOMAIN into virtualusertable, which makes no real sense to me... And it removed the domains from local-host-names, which is ok, but I would have expected a virtualdomainmap with the domains and a virtualusermap with the users...
So I don't see where mode 2 is going, maybe you can explain.
Anyway... I will switch back to mode 1 now :-)