Great post, I have a few thoughts.

1. This sacking and extermination variables do they take into account the religion of the area?

2.Isnt there a file/tweek (forgive my ignorance of the files) that allows you to obtain cash from destroying buildings?

3. If yes to 1. wouldnt it be logical to have a christian army kill more non christians? So should there be seperate modifiers for religion predomance in a region?

4. if yes to 2., can it be linked to the sacking modifier? It seems to me a bit more cash should be given for destroyed buildings and the money derived not soely from the population.

Just something that came to mind, great post.