Good idea, but most aircrafts' flight control systems can handle mild to moderate asymmetrical loads without any trouble. For those craft which are analog, like the A-10, asymmetry was still allowed, but kind of limited, such as having an ECM pod on one of the outer wing stations, and having a couple Sidewinders on the other wing's outer station. The drag may be comparable, but perhaps more importantly the weight was comparable.
From a purely aesthetic stand, though, asymmetric loads don't look quite right to me. But please don't mind my eccentricities, I never thought F-16s looked quite right carrying AMRAAMs on the wingtip rails, either.