One thing I think Dementlieu could really benefit from is more areas outside of Port-a-Lucine. There are two stretches of road that don't lead to transitions - In the area that leads north away from the crossroad that diverges toward the University, and in the area that has crossroads leading to the noble estates on the other side of the city.
It would be great if these roads could lead into the real Dementlieuse countryside, and offered some unique rural areas for RP and exploration that are less like the direct route rural areas that head from Port to Edrigan. Some wider areas to offer more spots for such, rather than the more or less straight, aisle-like route that the Avenue du Progress provides.
Some spots with countyside camps, or small, rustic roadside taverns, or perhaps more bandit lairs in such countryside areas would be a great addition, I think, and would offer some areas that cater more to other RP styles that the city environs of Port-a-Lucine.