I know this is probabli utopic but i like to show ideas:
I - Build walls in the map (during the game)
II - Create differen units (in eatch building(next topic)) that just creates more money or more food (for moral in battle or loialty)
III - Transfor cities in more than one point: with max soom you could see the little buildings: ex: market (where u have units to create money) Build a tower, building for new units etc (like a little grepolis) Ps: I prefer this than grepolis becouse we can use the map out of cities and be more creative.
iV - I have 5 ideas by minute, só i'll stop by now :p