I'm another one whose feet naturally turn out. When I used Look pedals years back, I always unclipped by turning my heel in with the pedal at the top. It worked for me, but is probably not recommended. When I switched to Speedplays, I had no choice but to turn my heels out to unclip. I can barely turn far enough to unclip (add my 20 degrees of natural toe-out to the 35 degrees required by the pedal). But I manage and haven't fallen over with them yet. After you do it enough, it becomes automatic. Anticipate your stops and unclip a few seconds early.