I like this. For PS3 users who don't have a mouse, it would have be when you start casting, the outline/diameter reach shows up and then you'd have to interrupt it if not everyone is in it and re-situate yourself and start casting again. Of course if you also used a mouse, the diameter/reach outline would show as Squa and others mentioned if you MO the skill. And the ability to activate/deactivate as well.