If you can’t change the stick, you have to change the aileron. To get light stick forces, you need to reduce the torque needed to rotate the aileron, which is called the “hinge moment.” Lots of things affect the hinge moment, first of all speed. Like lift and drag, control forces increase with the square of speed. Double the speed and the ailerons feel four times stiffer. Even before Melmoth 2 first flew, the French designer René Fournier, an old friend, looked at its ailerons, shook his head and warned in somber tones that the stick forces might get so high at very high speed — over 200 kias — that it would become impossible to move the ailerons at all. I don’t know whether this is true — my VNE is 190 kias, and I don’t go even there — but at a normal cruising speed of 145 kias, I can’t comfortably deflect them more than 3 or 4 degrees. And so I have been missing the great pleasure of terrifying passengers by rolling the airplane with no warning.