Finally got my FNP-9 and looked at the manual. Everything in there is a disclaimer to throw off the liability. Like don't carry a round in the chamber (guess their guns should be thrown at a burgler). Then they put the LEO exeption; something like check with your department for procedures on this. Obviously if police are allowed to do it, then mere mortals are allowed to do it. The one for pulling the hammer back has the LEO warning too, for quietly cocking the hammer. I figure it is just a safety disclaimer in case you drop the hammer and it fires. They can then say that the manual said not to do it unless you are an officer with permission from the department.
I don't think that I shall use that method, because I don't think it would be safe. I've never been that liked the idea of decocking a revolver by pulling the trigger and gently releasing the hammer. Just doesn't seem safe, so pulling the hammer back doesn't make me feel good either.