These are my suggestions:
a) Put some money reward when u kill villagers in Raid mode, like 30-40 money if u kill them.
b) Can be putted fire arrows? they could be used as well to light the houses ( anyway not as easy and quick like torchs do) , it would be cool also to see fire arrows during night raids.
c) In Siege mode, u can do this : The attackers must destroy the main door inside the enemy castle, when its done, the king of that castles comes out and the defenders must protect him or they lose.