here is a new feature request for KronoDesk:

There should be a way to move a ticket as a comment to another ticket. 

Background:

Very often there is a lot of email going back and forth with customers regarding one and the same problem. If customers send this directly to the developer - no problem. However we would like to have this documented in KronoDesk. So we simply forward the mail to support and KronoDesk creates a new ticket. We do not expect that KronoDesk understands that this new ticket really belongs to an existing one, but it would be nice to at least be able to manually move the ticket as a comment to the existing ticket, so that the number of actual open tickets reflects reality.

Kind regards

Werner

Thanks for the suggestions. There are some aspects of your requests that are already implemented: 

You can already have a different email template for each event. For example, you can have one event that fires when the status is changed and one event that fires when the assignee is changed. The subject line and body can be different for each event. In that way, the notification message will specify what was changed and its new value.

You are correct that it is currently not possible to include who changed it and the old value. For that, I submitted an enhancement request.