Share iCal calendars with other users

I am deploying a Leopard Server and all the Macs are able to create calendars, assign permissions, and enable sharing. Our use case is a scheduler/dispatcher who is in charge of several technicians. She creates the calendars and needs to be able to share them on their own CalDAV accounts.

In Calendar (iCal) on Lion I can set up new calendars and assign sharing along with permissions. In eMclient, I can create the calendars, assign the permissions, but not share with others so that it shows up in their calendar lists.

Am I missing a step, or is this a feature under development? Or is there a workaround?