They had the same ref at Leeds (Darren England) we had against Palace. The rules should be the same as an outfield player, a warning then a repeat or two means a yellow card then if repeated time wasting again, a red.
Pickford was taking 45- 60 seconds for every goal kick. All this gesturing holding the watch up is just for show as its not the referee who decides how much time is to added on anyway. What it does is break up the attacking teams rhythm and gives the negative team a rest
As soon as someone is red carded then the mindset will change