Well, ive made various factions hordes (unluckily the game CTD's after the second try, and no one has been able to help me..), and when you sack a settlement the owner turns rebel. They still get decent quality troops, so i don't know how good that would work out.
Plus, who's complaining? If a city revolts back to its original a turn or two after its taken, that is very realistic. You also have to remember that the city has(most likely) 0-20 public order when it revolts, so chances are it will revolt again and again until it becomes slave.
edit:typo
Bookmarks