Blizzard won't define a voice command as different from a keyboard keypress or mouse click. Where it will get nailed is if it can queue or delay commands or if it can generate more than one command per WoW with a single input from the user. Consider the following:
"FROST TRAP, BACKUP, DISTRACTING SHOT, ASSIST ME, AIMED SHOT, PET ATTACK"
This is OK because it's one action per input.
"Hunter Salvo One".
This, if it executes all of the previous commands from only one utterance of a voice command would be considered bannable because it is generating more than one action with a single input.