I couldnt agree more with this rule!!
I play fieldhockey at the highest standard in scotland and if there is any backchat to refs/umpires its quickly dealt with, the ball either being moved up 10 yards or a warning that if you speak to the official like that again your sinbinned for a minimum of 5 mins.
Beleive me it works it can be very frustrating but you soon realise you cannot get away with shouting or moaning at officials, as the ball is moved up 10 yards and they have more advantage!! There is also a rule that only the captain of the team may talk to the officials regarding a decision, it also works very well as there nobody running up and moaning to officials to take action as they are simply told to go away and the captain to come across.