Untill the DLL is released, I'm not sure it's worth the effort. There are simply too many even simple things that can't be added to the game. The City Lights project is an excellent example of this. I think City Lights is an absolutely brilliant and awe-inspiring venture, yet at the same time, I can't help but think how much better that project would be with such a simple addition as a code to lock a district to require adjacency to city center - yet that is not currently possible. I know it's a small detail, but it's an example of how limited code access locks the modders into using awkward and often somewhat unsatisfactory work-around solutions - in the mentioned case, using the aqueduct placement restrictions, which not only forces the desired city-center adjacency but also an unwanted fresh water/mountain adjacency.