Darthmod's most unwelcome change is OP garrisons as that's completely ahistorical. I shouldn't lose half of my stacks attacking an empty city. That nullifies possibilities for army manuever as occupying cities take 1/4 of your army.
I would like to reduce effecitveness or number of garrion militias using a pack file manager. Could anyone tell me which file I should edit, and the address for the appropriate cell?