It would be interesting to track age of everyone, if aging was taken into effect (series of virtues/vices based on age), but also if it was focused on a smaller scale campaign.

Like Hannibals invasion over the alps. Smaller provinces, more moves per year, aging of the soldiers etc.

Or an even smaller scale of warband level of skirmishing. Essentially battle it out with small units 1-20 each and have the campaign essentially focus on the size of a single province. A far more RPG version of TW focue.