RE: do ailerons provide lift?
Not exactly answering the org question but two cases.
I know from experience when you loose an aileron due to flutter on 3rd flight, as I did on my top flight P-39 (years ago) you loose lift!
I immediately lost wing area and thus lift on that side. She rolled quickly but I saved with full opposite rudder and aileron to make about half a circuit wings level. Well it was a short lived save as I made the mistake if throttle back just to 1/2 and suddenly she snapped rolled in from 50 ft.
When I had a servo arm come off one wings aileron, the plane appeared to have the same lift, it just felt really sluggish. Flew for about 5 more minutes but just didn have the normal,performance. Aileron was free wheeling with the wind and not "neutral" as if fixed to the wing, so it just kinda made the approach in with that particular wing a little low like maybe 5 degrees and a normal landing. Thus that wing did actually loose some lift.
So two lessons learned. 1: speed is life. 2: preflight you airplane after every flight.