It would be nice when you run that you lose stamina, when you roll you lose stamina, outside of that stamina shouldn't be used (yes not used in melee) Removing stamina would be a mistake since that could be usefull resource to have (that you have to learn to balance) and you never want to make less resources in games
Not really since it currently is lots of rolling until one of you runs out of stamina and then death for that person, if the rolling for both sides could go on indefinitely peeps would learn a better tactic than run the other out of stamina