The whole one key = one action, has been horribly misquoted a thousand times or so.
The point the GM was making was every action is a direct result of an input that occurs now.
Specifically, not the result of an input from 3 seconds or 9 seconds in the past; they don't want you to push one key now, have it Frost Nova, back up for a GCD, Cone of Cold, while you back up for another GCD, then Presence of Mind + Pyroblast... all as a result of the single initial push.
The game has this thing called the Global Cooldown, which specifically prevents you from initiating more actions at a given time, than they want you to use in that window of time.
You can push Scorch, Fireball, Cone of Cold and Blizzard, but they will not all fire off.
And even if you were to push all four hotkeys, whichever one fires off is a direct result of an input you made at the time the ability went off.
Taken from our Wiki:
"Here's the thing - that's not 5 actions. It's one action, per character.
It would not be okay, if, for example, you had those macros set up so that you had one button to cast frost nova, wait out the global cooldown, blink, delay for global cooldown, then cast blizzard all in a single button press. That is, of course, several button presses.
So, to expand your definition: 'safe' multi-boxing commands are one button press = one action per character."
Malkorix, Blizzard Poster
http://forums.worldofwarcraft.com/thread.html?topicId=9879768787&pageNo=1&sid=1#9
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