Hello, i think that a good option is to implement the ageod campaign system. I explain myself: in the ageod acw blue and gray , you have a very good and historical strategic campaign, but it lacks of battles at all. This game could be the key to have a really good strategical- tactical game asset, really better than total war actually is.
I remember that in ageod game when it come to a battle ask you some tactics that your army will adopt in the field, but all the battles are after autoresolved by the cpu, so i think that , rather then a tactical choice you could go in the tactical field and play the battle with this system and engine, maybe hard to work out, i simply dont now cause i'm not an expert.
Thanks for your good work.