I've belonged to a couple of clubs with that policy, but was never called on it. I need to admit however, I am no Josey Wales, but I know it, and don't try and pretend that I am. I make a point of doing that kind of stuff when the range is dead, I think that is the key to not getting barked at.
Personally, I don't want the guy next to me, who's skill is a mystery to me, practicing his quick-draw the next stall over, and I assume the feeling is mutual, seems like that is the neighborly thing to do. I always read that policy as a disclaimer of liability for the club in case you shoot yourself in the foot, and a way to make sure everyone can safely shoot when there are multiple people on the line. Talk to a range officer before you write a place off, they may be open to allowing some leeway on an empty range, they have been in my experience, though I am sure some are not.