Is it possible to mod in restrictions on who is able to hire specific mercenaries? For instance making a band of Roman mercenaries only willing to fight for countries in the Latin culture group.
THIS. This is very important
@Trin Tragula. I dont want Rome in a war against carthage being able to hire numidian mercenaries against carthage. I get it if for gameplay reasons you dont want that restriction.
Maybe make it dependant on the relation with the general? Like, for being of the same culture group you have a +100 relation with them. But you have had fights with thos emercanaries in the past, and also you havent paid them several times, so the relationshit is -75. Maybe only then other countries should be able to hire them but not you. Like rome promising to pay carthages debts or treat them better if they fight for them instead. We could go crazy and add the promise of making said mercenary general King of Numidia if he helps you win the war against carthage.

I understand if you can't implement that, but dont deny it would be awesome.
Keep it up. Its shaping up to be an amazing game on release.