I think the kind of incidents we're talking about involve a natural pause in play anyway.I think that might be ok if the ball goes out of play, or play is stopped for another reason- I'm not sure I'd like to see the flow of a game interrupted while these decisions are made.
Might as well go and watch AmericanFootball.
For example the penalty incident we've been discussing, the ref points to the spot and there's invariably a melee of players remonstrating with him and a delay of 30s - 1m+ before the kick is actually lined up. More than enough time to allow an off field official to view the incident a take a view.
So a suspected penalty offence occurs, the ref blows up and makes the screen signal, the 4th or 5th official views the incident and relays the verdict / discusses with the ref over the intercom.
It'd easily integrate into the game and might even add something to it.
