For future versions:

Ages: Stone, Iron, Copper, Bronze
New skill: Hunting & Tracking
New skill: Taloring
New skill: Metal working
New skill: Mining
New skill: Barter

Social Class: Laborer, Noble, Dignatary So forth

Expand farming to include cotton/flax and keep resource meters on them.

The way im thinking this will work, you go through a set of ages that are say like, the discovery of metal, how the econemy would work, was through some sort of localised government, you have a farmer he hires laborers, offers them food, and housing and skills in exchange for labor, which the farmer then will barter for tools to work the land. its sorta complex, but i think you guys can automate most of it.

oh i almost forgot, Hunters require tools and so forth, sorta internal econemy. relationship meters would be nice as well. for instance, boy falls in love with girl, boy cheats on girl, girl is depressed and refuses to work, boy betrays friend by sleeping with his wife, friend will nolonger trade with boy... this can go on forever