Email activity constraint: Operational T/F

It would be nice when filtering email activity history and email triggers (e.g. "was delivered email," "opens email") to have a filter for whether or not the email was operational. Obviously this wouldn't be that important if you are filtering the activity for one specific email, but if you wanted, for example, to do scoring differently for operational vs promotional emails, or simply to track the number of operational emails records are receiving, this would be very helpful. The system already knows whether an email is operational or not, so it wouldn't even be new information to add, just surfacing it in a new place.