I've been giving this a lot of thought lately, and I believe it would be of great benefit to expand some more of Dementlieu's areas outside of Port-a-Lucine, particularly around the Avenue du Progress.
As now, it's mostly a straight shot route between Port and Edrigan, and while built very prettily, there's no branching areas off the main road. I think the addition of some side areas branching off the main road, would be of great benefit. They could be as simple as forest clearings, empty caves, secluded ponds, or even abandoned homesteads in the woods, but such would add a lot more interest to the countryside areas of Dementlieu, and would certainly expand the possibilities for RP outside Port-a-Lucine.