I have a few ideas:

1) Family Trees
2) Marriges (The men and women in th egames are so unfaithful!)
3) More skills than just builder, scientist, etc. (Cooking, cleaning etc.)
4) Have jobs for teh villagers.
5) Animals they Villagers can raise.
6) Weather.
7) A kind of coucil the village.
8\) Hospital
9) Stores?
10) New Food.
I have others, put they have probably been mentioned already.