I'm not at all knowledgeable about modding MTW or STW, but have an idea that I think would be quiet cool. I don't know if it's possible, but perhaps combining medieval and shogun to one game, perhaps imaginary continents. Two continents, one with medieval nations, the other with japanese factions, and at some point, like a date, both sides develop the technology to cross the ocean, and east meets west. What do you think?