An idea... most mods for Medieval II (like Stainless Steel, but also those concerning other epochs like 1648 Total War) have a feature where a governor of a certain city acquires a title ''governor of xy'' with the city/province badge in his retinue which gives a bonus or malus. In RTR VII there was a similar thing with the ''governor of XY'' trait, which enhanced the public order of a newly conquered province.
Does that mean we could use the same function as for the MTW mods for RTW and thus for our own mod? If yes, I would suggest to consider the feature for our mod. To examplify this: You put a character in Lilybaion and the turn after he gets the ''governor of Lilybaion'' trait. Obviously it will be hard to find a picture like the badge, but we could still use it. Some ideas:
,,Governor of Lilybaion, one of the greatest fortresses in the ancient world''. + 3 turns siege time
,, Urban Praefect of Rome, home of the Senatus Populusque Romanus.'' + 20 % Happiness
,, Satrap of Bablyon, one of the most ancient cities in the world.'' + 20 % income on taxes
,, Archon of Athens, home of the four schools of philosophy'' +3 Management
Those are mere examples, which sprang out of my head right now, but I guess you get the general idea. So, is this possible, and do you like the idea?
