Thanks for the request. Currently there is a way to set this property through powershell for groups, but it only works for users in OWA. We have this in our plans for Outlook desktop as well and will be working on it.
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An error occurred while saving the commentAnonymous commented
Still need this feature. This is insanity. I can't use a group to communicate with employees if every employee can edit the calendar. Every other Sharepoint feature can edit permissions--this needs to be extended to the group calendar ASAP.