I the original "duffer"'s defense - I do recall there were such things.  That is: trainers with ailerons that could be "unlocked" as the student progressed.  These were basically three channel trainers and they were designed to fly without ailerons.  They didn't fly much better with them once they were unlocked, but at least you could see some roll action as a result of moving the ailerons.  For some reason the company MRC comes to mind.