I was just at the Hoosier Dawn Patrol in Muncie, Indiana last month. Art Shelton had a 1/3 scale Fokker Eindecker E1 there that used wing-warping for lateral control.
Even though it was a bit windy that weekend, the E1 flew well. Part of that was undoubtedly due to the skill of Art as a pilot. In fact, several times he was heard to express his admiration of (and desire for!) ailerons.
Sure looked cool, though.
Dean