I think it would be nice to have the civil war implemented.
The popularity thing I think should be used, a small scale with the popularity of the masses and the governing body (or father) with the information chart of the character. If a unpopular heir is chosen over a very popular one, then the popular one can march to the capital of the empire and declare himself ruler.
And if it is implemented, then neighboring nations can declare support for a heir, if provided with a "contribution" (denari, land you get the idea)
Then the Greek Cities support Achigontias as Seleucid ruler for protectorate status.
While Ptolmey supports Alexander as Seleucid ruler for 30000 denari and Antioch.
It would also make your protectorate status more interesting if two parties were formed. Declare yourself for one, and fight for them.
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