Mobility Rules Issues

Hi All, I'm done setting up my OD Master and the Groups and Users stuff (on Tiger Server) but I'm now stuck with an issue : when applying "Mobility Sync" for a group of laptops the machines do prompt users to create a mobile home folder. But wether the Login & Logout Rules remain empty or disabled, Dekstop, Downloads and Documents are sync'ed at login... I even tried to add those folders '~/Documents" to the skipped login/logout items and they still get sync'ed at login and logout... I choosed another Computer list, applied Mobility features and tried the same settings and every user, on any laptop or desktop gets Desktop, Documents and Downloads synchronized at login and logout. Which settings do I have to override in order to only sync Desktop at login, and some other stuff during Background Sync ??? Are there "default folders" to be sync'ed at login ? Server : OS X 10.4.11 Client : OS X 10.4.11 or 10.5.1 Thanks !