Yes, this is the proper thread to post feedback regarding the recently updated Waze Map Editor. You are in the correct place.
The forum is a place for discussion. So often you will have other members of the community responding to posts. Waze staff doesn't have the time and/or the will to respond to every post from the community. We are attempting to help communicate what we know so that your post does not go unanswered. Although you could get lucky and get an response from an actual Waze employee too.
Directionality of the road does not change if editing other segment properties such as name, road type, etc.
The general recommendation is to lock segments on high-value/critical roads. In the future Waze has stated that the security model will change and new editors will be limited from editing certain road types automatically as part of the security model.
Wazer in San Diego, California USA and Tijuana, Mexico
iPhone 5, iOS 7.1, Waze 3.7.8