Two things that I miss: Slaves and military logistics. Slaves were important in ancient economy and common cause to start war in ancient times was the need for slaves. I really like to see enemy units to captured slaves and put work, while mine military units watches after them. Of course without adequate supervision, slaves may run away or attack. Logistics were important in ancient warfare and female units can be used also for that. In ancient times army may made up of families. These changes would require that the units would need some kind of maintenance and gameplay needs to be adjusted little more towards resource management and construction and supplylines requires larger maps. Construction of anything should take much longer (some projects takes decades to complete in ancient times!) that emphasizes the fact that the most important resource is manpower.
