While im interested in other type of combat movements, i think, it is impossible to implement in the current engine.
Making something like this should lead to an engine and combat system full modification.
Nevertheless, i did suggest the same in the Steam forums years ago. In order to make battles less boring with the time.
U see.. In Warband, at the beggining of your game, battles are fun. But after a while of playing, they turn very monotonous, and you end sending your troops to battle without you.
Adding some of this things should make battles more dynamic and complex as well.
Things as roll or dash if u re not on heavy armor, counter-attacks movements as well as combo attacks, i dont have a formula to balance this, but in the future on a next Mount and Blade game, this is a MUST to renew the combat system.
How the AI could make this movements? I dont know. But there must be a way. Of course this will make the fight algorithm a lot more complex, so, more resource consumimg, but there should be a way