Flatten terrain feature for paths is great. One thing that I guess could be possible (from devs side of view) but that would save hours and hours of work is enable up/down path.
When you go up, there would be flat gradual uphill for the road created (now it creates elevated road). When down, flat downhill.
When you go up, there would be flat gradual uphill for the road created (now it creates elevated road). When down, flat downhill.