[SNIP] let's not forget that the stearing wheel will automatically lock, if power goes out [/SNIP]
Your car may lock its steering wheel when power is cut, but no car I've driven in a quarter-century does. I've had many occasions to key the motor off at speed (isolating engine and transmission when diagnosing problems) and steering continues working, though unassisted.
So long as the key is in the ACC or ON positions the wheel lock should not engage. Also, if you're in a manual or are quick enough with an automatic (and don't go to neutral first), putting the key back to ON will re-fire the engine.