its not easy even with advanced editor because there is only 10-12 nation files you can edit. rest is hardcoded and cant be edit. you will have to recreate whole fixture and discipline rule tree for every country. i can see wich countries i can edit but number is not big. one more thing. you can make nation (fixture and discipline rules) files in advanced editor for fm 2012. they will work in fm13. if you know how to use advanced editor this isnt problem