Actually, ltw2, I did not state that the players have to agree to it, but the PGA officials have made decisions in the past to allow lift, clean, and place due to unfair playing conditions (too much water).
pf's situation, IMO, is an extension of this. They are their own governing body since they are just playing with friends.
You must remember that it is still a GAME.
I compare it to a pick-up basketball game. When my friends and I are playing someone is not allowed to pick the ball up and run across the court, but every nit-picky foul and carry is not called. We're not professionals and we understand that.
If I were to play with you, then full PGA rules would apply. I don't mind that, and I actually feel like I play better when this is the case (my score may be worse, but I feel I am in a better mind state). But if the group that I am playing with has certain rules that they use, then I don't see the big deal in obliging.
Just my take.