Talked to Steve Dower in a sidebar about the issue with compile-time configuration, he is convinced that compile-time configuration is not something that would be useful or worth doing on Windows. I am indifferent on the matter, so I am fine with calling the compile-time configuration part of this done at this point. If anyone building Python for Windows shows up needing support for this, we can re-visit the issue — I don't believe it's technically infeasible, just that the usage patterns of Python on Windows mean that it's not worth doing.

So, once we've got a critical mass of reviews done for zoneinfo, I think this feature is done. 🎉