Good morning Neutron
I have some ideas about the development of religion policy, because during the game, you can research, and later, build some schools and temples, for example, mohist or confucianist temples and schools.
Throughout history, in China had been some religious disturbs and policies that banned foreign religions like buddism or nestorian.
In my opinion religion is a very important part of the Chinese history, and I think that it must have a place in the game.
Some religions that can be added in the game could be Nestorian (Diofisist Christians) or Manacheism, for example.
Thanks for read this.