One thing I think it really needs, and I'm sorry if this has been discussed before (I skimmed through some of the thread), is a PDF file that offers a sort of brief introduction to the world, the nations and their fighting styles (possibly with examples of "real world" counterparts with similar troops), along with some info about allies and enemies and such.
I think it would be great to have some of this information BEFORE you start the game. When I first loaded it up and got bombarded with questions about my heritage and nations/professions I that I had no idea about I was quite confused, to say the least.