[Edi]

The biggest problem with this that I can see is that the base resource value of a province is random and then added to by population, mines etc. At least that's the way it has seemed to me. Besides that, the resources are not assigned in the map file, but during game generation. So there is no objective way to implement this that I can think of. Not unless the program can insert instructions into the Dom3 game creation process after map has been selected and other settings determined.

Of course, I could be wrong.