I've been experimenting changing values with wordpad in these files. So far I have changed ImageID = symbol_general_1.png numbers to show different numbers of stars; leader rank, Title and Strategic settings with no problems.
I'm a little leery about the Is Promotable setting as I am unsure how promotion works. Can there be more than one 3 star general in each faction? If the lone 3 star general gets killed, and no one is promotable will there be no three star general anymore?
What would happen if two leaders with the same effective rank and the same seniority were in the same group? Is such a thing possible, or would it cause a problem?