It seems like a good idea if your style involves hanging the plane from one line in extreme manovers. If you hang by one line it would be nice to have the lines come out together. But if you fly with tension on both lines I do not see any benefit from the up or down line being fore or aft.\
You don't have to hang the airplane on one line. The same effect, to a lesser degree, happens any time you deflect the controls. Any time the controls are deflected, there is more tension on one line than the other, so the force applied to the leadout guide, it any, it higher on the "active" line.
Brett