I was about to say, well tough luck wrong engine, but your post gave me a crazy idea.
I was thinking about Massalia and other cities who thrived while trading with the ''barbarian" hinterland and it popped up: a building - a trading post say - who could give a X tax bonus (not in %, but a flat bonus) per Eleutheroi provinces adjacent to your own. So it wouldn't be trade, but it would represent the income generated by that trade with the tribes. It's a building that would be good in the beginning of the game, but it's utility would drop as the eleutheroi is gradually conquered.
History wise, it would represent the great wealth that relatively small cities like Massilia, Tanais and Cyrene had, and it would explain their "decline" as the hinterland got settled. It would also explain why many empires (including Rome) would conquer a colonial polis and leave the hinterland alone for a hundred years.
I don't know if it would work, if it's even modable, but I had this stupid idea and I had to write it. Just in case.
BTW Scumbob22, there's a game, called Europa Universalis 3, who try to have an historic and active simulation of the small countries. There's about 200 factions, from all over the world, ranging from the Ming empire to the iroquois confederacy. It looks good but, well, the problem is that all the 1 province factions are all gulped up in the first 50 years of the game by huge countries/blobs. While the idea of a titanic fight of 100 000+ armies in the steppes north of the Caspian Sea between the Ming and Lithuania can be quite engrossing, it's a little bit dull when you play Muscowy and the Ming army is five time bigger than your entire population. After 100 years, the world map looks like several fractals colliding with each other. And game after game it's all the same. The Ming in Russia, Vijayanagar ranges from Pakistan to Indonesia, Spain conquers all the Maghreb, The Mamelouk conquers Africa up to Zanzibar and the rest of the world is splitted up between France, Burgundy, Lithuania and Austria. It grows dull. It grows unmanageable. Damn.
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