Delayed sending of notifications emails

Sometimes a issue changes more than once per minute, e.q. in a meeting to get the issue 'ready'. If this is case, the reporter and watcher receives a email every time a change is entered in the issue. This is generating a lot of email.
(In our case the reporter is the customer and we don't want to get annoyed by the huge load of emails).

I would like to have the possibility (in a notification scheme) to delay the emails, so that multiple changes are combined in one email, rather than several smaller emails every change. Or the possibility to select to get only one email a day.

This improvement I would very much like to see in the next version.