Not sure if it’s known but in the zone dialog you can click the map to place the zone, so I don’t think it’s that painful to add.
Zoom out
Zoom into your target
Click to place zone
Generally I think reverse-geolocation (address to coordinates) is not generally a free service, we don’t offer it because we would have to pay a commercial service that provides that data. We have very limited support in onboarding but I think we didn’t want to expand further than that.