I think what you are trying to do sounds fine. /click is used for this all the time. blizzard's 1 key 1 action rule is to make it so you cannot add delays to have that 1 key press continue to do actions for you after you release it. You can press as many keys as you want simultaneously and the only thing you are limited by is the global cooldown and wow's api.
How many of us click forward, jump/strafe , and an instant cast attack. You just clicked all 3 simultaneously and each click corresponded to 3 different actions. This is allowable by blizzard.
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