Build cities and towns is in itself a game.
we need better tools and models and that the community can share their designs an easy way (like a puzzle, where I can make and assemble a sector to another)
Before we get further and uniform leveling of the ground surface (airports, residential areas etc.)
when we superimpose on other elements, the latter must prevail without any void. (road over and smoothed surfaces)
alignment of different elements by default (road or flat surfaces)
and all without breaking the mesh.
in my opinion, this would facilitate the construction of cities and airports.
any game need SDK and API for third parties to develop their projects.
if the idea is not good you can look at this photo.https://www.flickr.com/photos/awac9/23609133885/in/dateposted-public/
An example: we want to create within the airport Outerra Sedoma / Arizona) and a fantastic place to outerra appropriate. but we find many difficulties.
we will see the video, of what outerra, then reality and end another video of what we have to achieve
we have to come here, but not photorealistic images with outerra own models is undoubtedly the best