ME combat is missing a few stuff that other games that have medieval or similar eras combat have:
Stabbing: A piercing forward attack
Parry: An attack after a defense. In order to not make this easy, this should only count after a non hold defense, for example, raising your shield on a single click, then attacking
Cancel/Faint: Acting like you are going to do a kind of an attack, then not doing it. The thing is that an attack could be linked here.

Also, I dont know if this already in game, but certain weapons should hurt more depending on where they hit, for example, a mace bonking you in the head will nearly crush your skull, while a mace stabbing will be less hurty than a sword.

Adding stabbing could open a new range of weapons, like spears and halberds.

If for whatever reason, horses are also added, spear-like weapons could also be couched in horses, in order to create jousting tournaments