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We were planning to add notification to redelivery functionality but did not see enough traction for it. Are you looking for the notification? What you like to see in the notification? and what are the channels?
You state, "However, it does not allow any additional functionality."
Will you please elaborate on "additional functionality"?
What I mean is, on-failure(when it reaches the max redelivery attempts) the QoS Redelivery settings only allow you to either "Suspend", "Error", "Redirect" or "Delete'. It does not allow any code to be added. We want the instance to be suspended AND an error message sent to another web service to log that it was suspended.