Is there a way to reduce the notifications from Kronolith?

We are currently considering Horde / Kronolith as a calender backend for 
our small consulting company. I say "backend", because most users will 
use Thunderbird/Lightning, iCal, Outlook or whatever as the frontend 
with the Kronolith calendar being subscribed therein.
Frequently, these tools save an event with no obvious change. And every 
save operation seems to generate notification e-mails to all attendees, 
which we consider somewhat annoying.

Which options do we have to reduce the amount of notifications? 
(Hopefully by configuration, and not by updating the source. ;-)

Regards,
Christopher Etz
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