You could use the corrupted part of health bar and stamina bar to do quicker combat spells (left mouse and right mouse button)
Perhaps the perks that activate on its own could be activated by clicking the left and right mouse button so you could have tainted vessel in the left hand while you kite around the wall of fire that you used in the other hand. You could also summon demon lord this way, it should spawn facing the way your looking and attack anything it sees in front of it, still being uncontrolled as it will pick its target on its own. I feel the corrupted bar is a resource you should be able to use. I feel the perks should have been the way sorcerer fights rather then chance based proc.