More Strengths/Weaknesses needed
For both custom sovereigns and custom empires, there needs to be many new choices. I like some of the newer ones like the light plate stuff, but there simply aren't enough of them. Maybe there should be one that gives Life Magic to Empire and Death Magic to Kingdoms. Maybe there should be one that makes your people Desert folk and instead replaces the grass terrain with Deserts and you get different stuff. There is a LOT that can be done here to make races more unique and make each play though more unique as well.