Point 1 - I have been a linesman in the past, it's a piece of **** to do. It's easy to know when a ball is kicked and still look along the line. The linesmen get it wrong because they are stupid. There is no legislation for that.
Point 2- Lino 1 would have to know eactly when the forward pass is made, otherwise he would be anticipating every forward ball and pressing his buzzer every 2 seconds.