I feel your pain, my gas pedal got stuck on my carpet once, the car floored it. I was in a manual transmission car, so i just pushed the clutch and cut the ignition. In the SVX if it's an auto, simply shift up one to neutral and cut the engine.
Also, testing in parking lot, even if empty... What if it gets stuck again? The SVX can transverse a parking lot
very quickly if the accelerator gets stuck and your doing 90mph.