I was loading up my Third Age campaign earlier today when I had a thought.. You as the player have possibility of bringing Gondor back to her former glory of course, but never can your Stewards take the title of King, even if they vanquish Mordor and reunite the Kingdoms of Gondor and Arnor.
I was wondering if it was possible to change the title of Steward to King via script, after you've fulfilled some preset conditions first.
Now I know it's not exactly lore friendly to have Denethor become King, but this is Total War after. Make your own legacy and all that.