Q: Group Delegate in Calendar Server

Is there a way to assign a Group read/write/whatever permission to a User's calendar?

I'm not trying to create a group calendar, I have that covered; I just don't want to have to edit 40+ CalDAV accounts each time somebody joins the company!

eg:

Users Fred, Barney & Wilma are members of a Group called "Diary"

Betty joins the company

I assign the Group "Diary" as a Delegate to Betty's new-created account.

Fred, Barney and Wilma now have read/write access to Betty's calendar as per the "Diary" group permissions.

Thanks in advance,

Paul.

OS: Mac OS X Server & Client 10.7.5