For Hero cults/Imperial Cults, it'd be cool if after a particularly prestigious character died there would be a chance for cults to spring up which worship them. Becoming a patron of a cult which treats your father as a god is a good way to ensure that your dynasty gets respect.
I also think they could do with some unique CBs. A holy war CB wouldn't fit, but a subjugation-like CB would. Ideally it would subjugate land without usurping the counties from their original holders, so you could reflect the multi-cultural nature of the Roman Empire by having vassals of many different cultures and religions. To help stabilize your diverse realm maybe they should also get an opinion bonus like the Jains have, or at least a diminished infidel penalty. The Romans didn't force subjugated cultures to convert, and their persecution of Christians was more of a political nature than religious.
I also think they could do with some unique CBs. A holy war CB wouldn't fit, but a subjugation-like CB would. Ideally it would subjugate land without usurping the counties from their original holders, so you could reflect the multi-cultural nature of the Roman Empire by having vassals of many different cultures and religions. To help stabilize your diverse realm maybe they should also get an opinion bonus like the Jains have, or at least a diminished infidel penalty. The Romans didn't force subjugated cultures to convert, and their persecution of Christians was more of a political nature than religious.
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