We have Shaded Work options of Auto X-ray and Fake Space. I'd like to suggest a Global X-ray display added to the Display Options. A toggle between the default Shaded Work display and the Wire Frame display that could quickly be turned On and Off.
With Auto X-ray ON when I move an object behind another, the object in front disappears. This isn't what I'm looking for as I want to see a relationship between objects. Perhaps there's a setting I'm missing. This isn't the reason however for my suggestion. My suggestion is rather for speed of changing between Shaded Work and a Global X-ray display.