I think it would make combat a lot more fun if you could evade attacks by rolling to the left/right or backwards. There already is a forward roll perk in the sneak tree so you could just use that animation for it. Just make it roll to the right/left or in reverse for backwards when you press that direction and the sprint button. I would rather my assassin do a barrel roll to avoid hits instead of running around like a little girl. They totally should have made an acrobat skill tree for this.