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There was an old thread on this for ZDesktop and older versions of NE but for ZCS 6.x, wondering if creating new roles is possible through the GUI? Can't seem to find it. I know it can be done by command line interface (CLI).
Looking in the Rights module of the Admin Console, I don't see granularity, for instance, on items like Add, Remove, Accept, Decline, etc., for the calendar.
Bugzilla
Wiki
Source
ACL on Calendar 
Linear Mode
