This trick solves, or at least makes more managable, a lot of lighting problems. Try parenting all three lights to an invisible box prop at the center of the scene. Also set each of the lights to "Point At" this same box. This allows you to rotate and translate all the lights en masse as well as allowing you to change to position at which all of the lights are pointing by just moving this box prop. This prop can remain parented to the universe, or you can parent it to one of your characters if you want the lights to follow them around. This also allows you to scale the lights (which you cannot do to individual lights alone) by scaling the parent box. Scaling the lights this way has a profound effect on edge transition smoothness of the cast shadows. I've got a tute on all this somewhere but I'm at work and don't have the url. Its in here somewhere -- if interested, search on "shadow" and it should pop up.