But what is the goal? Standard F3A designs have been able to do knife-edge loops for years now with half-rudder. Do you want more lift in your fuselage so that you can loop with 1/4 rudder? Do you fly knife-edge all day long or do you want what we all to, to pull a minute-long fourpointer with just aileron and no rudder/elevator input? The problem isn't fuselages not lifting sideways, it's roll coupling. There's no such thing as a non-coupling aeroplane unless we're talking counter-rotating props but the coupling can be reduced with wing and stab position, thrustline and of course the mighty CG-issue.

I'll take a plane that barely does knife-edge with full rudder any day if it does so without rolling towards the wheels or canopy.