In my current romani campaign I'm using type 2 govts in Italy, Spain, southern Gaul, greece, and the balkans. These regions historically had either proconsular or propraetor governors from the beginning. In africa I use type 2 govts for tunisia and type 3 govts for the western portion( algeria and morocco). For northern gaul I plan to start with type 3 and transition to type 2. As for asia I will probably go with type 3 and 4 govts to start and transition to 2.

From my reading of the histories Rome did not rely on allied client rulers in the west as much as they did in the east. In the west Mauretania was the only allied client state to remain free from direct roman rule during the time period of the game. In the east Rome used client rulers alot due in part to the distance from rome and the high degree of civilized Greco-roman rulers already in place. Gaul is the only area which I'm still debating as its not clear to me if Caesar installed client rulers or instituted direct rule from the getgo in his conquest of gaul. The subjugated celtic tribes retained some internal political power the ten years of the gallic wars but with Caesar and his ten legions sitting on top of them just how much freedom they retained is questionable.