in our opinion, the ultimate wonder should be able to perform all aerobatics manoeuvres, like flat spins, knife edge and so on. That's impossible to do without rudder and throttle. In order to compensate for the increase in weight, we will build a slightly bigger wing.
the wonder twin you see above fall from the sky in inverted flat spin like a frisbee and when fly by a good 3D pilot (not my case) is able to hover. we compensate the lack of rudders efficiency due to the short tail moment by mixing the rudders with the engines and we use assymetric power in aerobatic

diferent opinions, but your idea of keeping it light and simple will certainly result in a Highly nimble funy bird