Something that I would find immensely useful at some point is being able to skip an entire actionlist at once. While it's running I mean, not beforehand with a variable check. Something that skips to the last action when the player presses escape (or whatever). For testing purposes too it would be nice, to 'speedrun' through some sections.
I remember AGS did something impossibly complex where it did still execute every command when you hit the skip key but just stripped away all the waiting time and visual feedback somehow (when I used a timer GUI it even skipped forward by the appropriate amount, which is bonkers to me), but something like that would be a very wonderful feature to have.
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The AGS solution you mention does sound like it's along the right lines - it would indeed need to run (almost) every Action. Assuming there's more detail to be found, any chance you could find the link to where you heard about AGS's method?