A conundrum to be sure. We want a biplane that has negative upper wing incedence for stunts, but a positive incedence for take-off and landing . . . with a tail that has positive incedence for level flight at mid-throttle and above but "squats" at low speed for landings.

Flaps actually chance a wing's angle of attack. The rear 10% of the wing bends down so the wing's datum line tips down at the trailing edge with it. Be awfully complicated to build the Phaeton with dual & seperated upper servos that act as flaperons while the lower ailerons remain only ailerons (especially as the stock build is a single central servo and lower ailerons only).

What you have to do is build for the maximun performance at the operational points that are most important to you. The pattern ships and better aerobatic models have adjustable incedences. Wouldn't that be nice.