encounter targetting arrows of tanks target

[svann]

If I target a mob directly and he is in an encounter group I can see that because all his friends get lit up as well. That helps me know how they are connected and what to cast. But if I am targetting the tank and casting through him then I only see his target lit up and not the rest of the encounter. Id really like to be able to see targetting arrows for all mobs in the encounter even when Im casting through the tank.