Disable calendar-auto-schedule on server
Emails created by server when calendar-auto-schedule feature is enabled cause problems for some clients. As clients, at least Thunderbird, does not allow to disable this feature, it would be a good idea to foresee the option to disable this at the server.

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Brian J. Murrell commented
I think this sounds like what I would like also. Some people might have more than one calendar provider and would appreciate the invite e-mail so that they can decide which calendar to accept it into instead of having fruux assume that it should be in their fruux calendar.
So I propose that this feature (auto-schedule, or deliver an invite by e-mail, even for fruux users) be user selectable. Defaulting to auto-schedule is perfectly acceptable.