I am not sure how you would go about doing this but a suggestion for changes would be making Hussars, Cuirassiers effective at swinging on horseback but not so effective on foot in melee. However making Dragoons better on foot and weaker on horseback, so the reverse. I imagine a way to do this is reduced dragoon riding skill, but an increase in dragoon accuracy with guns (firearm skill) would be good.
This is just my opinion, dictated by my experience.
Oh and another point, it would be great if people can just post their suggestions for changes and for this 'discussion' to finally end as all the attacks on other people's opinions and suggestions is becoming boring, repetitive and spammy.