You know...I was thinking exactly the same thing.
Class: Light horseman
Weapons: Spears,swords,axes,knives,maces.
Armour:Light,medium,shield
Skills:
lvl1= Horse/dismount,Swift attack,horse kick (ouch)
lvl3= Horse apprentice (+20%morale for 20s)
lvl20=Heroic charge (charge at ennemie causing massive damage (+300) cooldown=15min.
Class: Heavy horseman (has heavy armor but most "Good" Skills come late.
Weapons: Spears,swords,axes,knives,maces
Armour: Light,heavy,medium
Avaible to (both class): Men,elves.
These could be added when they do rohan
Only problem: everyone will want to be one...