I think the best thing to do is never let your wheel unattended with FF on. I stood of from my chair for a minute to get a drink from my fridge, I thought I had set the parking brake, but I hadn't, the car started rolling backwards, and the wheel slammed to lock, then whipped back and slammed the other lock. Nothing was damaged, it really was no harder than the wheel hitting lock while calibrating itself, but it did make me jump for a sec.