Interact with target could work somewhat.

If you enable click to move in the mouse options in wow and then bind Interact With Target in keybindings. Then when you press the IWT(interact with target button) the character will try to interact with the target = attack/talk to it and move in melee range with the target. Since casters don't have to be in melee range a quick combo of IWT + move backwards is enough to face and can definitely be helpfull.