RE: do ailerons provide lift?
The airfoil does not need any taper (the correct term is chamber) to create lift. Proof......look at all the foamies with a simple flat plate wing. They still fly don't they, those wings are still producing lift. Whether the aileron is tapered or just a flat plate attached to the back of the wing does not matter. As long as they add to the total wing area, they will contribute to the lift produced. Flat plate type ailerons might be a little less efficient than a tapered one tha continues the airfoil shape, but they will still work the same.
It is really simple guys.....increasing the total wing area increases the lift produced. A simple study of basic aerodynamics will prove this. It doesn't matter if the additional wing area is airfoil shaped or flat.