Blue Uriah

That seems rather harsh. It's a fairly common mistake for weaker players to confuse a natural 2NT with an Unusual 2NT, at least in the UK. I think double from North is completely normal. He's got good defence, his opponents have already signed off twice and are clearly bidding like idiots, his partner has acted at the four level and he has no desire at all to encourage him to bid any higher. South's pass also seems fine to me. His hand has its uses opposite both minors but it's hardly a thing of beauty and 4♣ was probably enough. Now partner has decided he wants to double the opposition and you don't have any major reason to overrule him. As for the ruling, East/West's bidding is so abysmal (aka 'wild') that I'd let them keep whatever they got in 4♠X. However, it does seem clear that East was about to pass when he heard the alert and lost all his faculties, so we'd have to adjust North/South's score. The director should talk to them to see what they might have bid over a pass from East, poll some other players and see if he can figure out where they might have been heading.

Is it so simple? From the way I read the OP, the bid was alerted (unless you want to accuse East of lying) but North didn't notice. In normal circumstances that would be inadequate - East has to make sure the message is understood - but given the prealert and the fact that this sequence had happened "a few boards earlier" surely some leeway is warranted? Perhaps you feel that you'd still adjust - fair enough - but what if there had been three transfer responses in the match so far? Or ten? Surely at some point you draw the line and tell North he should have known better, just like in your Stayman example.

One thing I've never understood about this topic is why does the frequency of the psyching make any difference at all so long as you act ethically and don't field it? If your partner does it a lot then you might be more aware that it could be a psyche than your opponents are but I don't see that as a problem. You can't gain any advantage from this greater knowledge without fielding, which is dealt with in other ways.