Having physical problems when playing a class might be an indicator you should play a different one instead of insisting to change a core mechanic? Perhaps try something different?
No offense, but any change to the class as it is might put off a lot of players. It's popular because it's braindead easy to play, and expecting to have any level of complexity attached to it is naive. Blizzard stripped DH of any complexity because it neither does appeal to the masses who couldn't even use the class properly with 2 bis legendaries, nor do they want to limit themselves with encounter design.