It would be nice to have this feature. I have two zones setup for my front yard camera. One for detecting person and cars on my driveway and another for whole view for motion. I'd like to be able to record for any of these events but only notified for the events for the driveway zone. For example I record the whole view when someone riding a bike on the street but I don't want to be notified for that unless that person steps on my driveway. 
if i keep driveway zone i lose the ability to record other events outside of it. If i extend the zone to whole view then i get notifications that i don't want. I can setup multiple zones per person or a vehicle but notifications setting only controls the camera not the individual zones.