I've always found it better to play the tank and control the dps through isboxer and different movment keys. Like i set up my A,D keys for strafe on my Ranged dps/Heals. and i use my Arrow keys to move them when i dont want them to acutally follow. Best setup I think might be Tank 2 range dps and a healer. That way you can charge in with the tank keep your dps and heals stacked and then strafe them out of ground aoe or move them forward and back.