You CAN develop the ability to raise the correct arm for the "stop clock" signal and then use the same arm to point in the correct direction. It takes some work (summer camps and preseason scrimmages are great times to practice this), but it can become second nature pretty quickly.
And on those occasional calls where the wrong arm goes up, get the call right by using the other arm to point or turning your body slightly (don't turn away from the play) to get a better "pointing angle." (The above posts about not crossing the arm over the body is really good advice. That probably is the worst way to compensate.) Only you and your partners (and maybe an evaluator and other officials in the stands) will notice.
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