"Generals" or "Leaders"
One idea I have had for a while now is the creation of generals, or leaders. They would not act so much as a unit, but as an AI loyal to you. You could allocate a certain number of resources to them, and give them orders, something like capture a certain city. The general would then build up an army to the best of it's abilities, according to how many resources you allow it to use, and than go attack. Once it has completed its task, it would ask for new orders.
You could also set them to defend certain areas (would attack enemies within a certain range), defend cities, or just even build up an army which you yourself could control at a certain point. I think a feature like this would be useful in late game senarios. I think back to some games of Civ that I have played, and will be fighting on twenty fronts, and building things in thirty cities, and each turn would take forever. Now sometimes I enjoy that, but sometimes I would love to just let the computer take over some parts. Maybe at the beginning of each turn you can get a report, with a status update from each of your generals or leaders, telling you what they have completed. Leaders could be more non military, like mayors in cities. You could specify a direction you want a certain city to take (like science) and the mayor would build buildings to achieve that goal (simular to the auto build feature in civ if I remember corectly).
So basically you would have generals to help manage your offence/defence (maybe they can level up as well, based on number of victories and what not, granting bonues), and leaders, like mayors of cities to micro manage city production. Then at the start of every turn, you would get a single report telling you what has been accomplished so far (as opposed to civ, where they would bounce you around the whole world telling you what each individual city has completed). It would turn some of the micro managing into macro managing. These generals/leaders could be part of the whole family system as well, with names and positions. Maybe they can even be moved around like a resourse. So if you have a mayor who is really good (because of certain bonuses maybe), you could move them to a city that is strugling, which might help it out a lot.
Ok, I have writen more than enough, hope I my idea is clear... it makes some sense in my head at least, but might be to complicated to implement.