Later on in that discussion, it was brought up that it’s in the shortcut section:
Shortcuts and Out of Order Sequencing:
Some players will take an action with a shorter method than the game rules allow or take multiple actions in the incorrect order. Oftentimes, this is merely a method of playing the game in the fastest way possible or to avoid forgetting a trigger that would resolve after a number of other effects. Shortcuts are allowed as long as players have agreed upon the shortcut and the end result is the same as if each action were taken individually. Out of order sequencing is highly discouraged, but it is legal as long as the player performing the out of order actions explains the actions before he or she performs them and the end result is the same as if the actions were performed in order.
(p. 25)
Moral of the story is communicate before you use them. Otherwise, a proper judge, which I don’t believe there are any yet (besides Lukas), will try their best to rewind the action and likely rule against the person that used a shortcut without consent.