Well, the answer would be to have the mix feature assigned to a switch so it could be turned off.

Problem with mixes is that they are crutches.

Problem with switches is that you sometimes hit the wrong one. I dorked my Hot Stik last weekend when I wanted to switch to low rates for landing and, at 20 feet, I hit the low rate AND air-brake switch next to it with my fingertip. Problem was I had been toying with my air-brake feature at home and had a ton of down elevator mixed in. The Hot Stik is about 30% control surface on the wing and 75% control surface on the h.stab. It did a 90º nose dive instantly. I recovered at an altitude less than the landing gear was tall and tore it out of the bottom of the plane; pancaking in and shearing the motor mount arms off the bases. Amazingly the prop was OK . . . though I broke teeth out of three of the four aileron servos.

Three night repair, three replacement servos and I count myself as darned lucky it wasn't 2" closer to the ground.