Wow, great Idea.
I wonder if it is possible to try a similar city planning based on (purely deterministic) cellular automata. Maybe it could be used not only for Townscaper, but also for real world's city planning. It would be great, if we have a 2D or 3D CA-rule which determines optimal city development (although it will be hard to determine the optimal CA-rule which is a common difficulty in NKS - most likely it will require an exhaustive search).
Happy New Year!