We have a player who, as Declarer, will detach a card from hand and stand it vertically on the table, holding it by a finger resting on the top of the card, before slowly letting it drop face up onto the table - when does that card become "played"?
And, on the subject of cards being detached from hand, I can see that a player who detaches a card, replaces it, detaches another, replaces it and finally plays a third card COULD be giving UI to partner - on the other hand they might just be totally confused. I think in most cases at our Club, the partner of such a player would look quite puzzled if you told them to "carefully avoid taking any advantage from that UI" and would have no idea what information they may have received.

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