This is an OBR rule, and is intended to prevent a quick pitch: the scenario to be prevented is one where the pitcher can hold a runner on base by straddling the rubber, take his sign, then step onto the plate and pitch before the runner can get any significant lead.
It is not the purpose of the rule to prevent anyone else from giving signs to the pitcher. So, properly interpreted, the rule would read, "If he takes a sign from the catcher, the pitcher shall do so while standing on the rubber."
As an umpire, I do not get involved in semeiotics, so I will not be looking into dugouts and watching every defensive player on the field to see whether they might be doing something that could be considered a "sign." I don't care whether the opponent complains: if they say that you're relaying signs from the dugout I'll say that's not illegal, and besides it doesn't look like signs to me.
To answer your questions:
1. OBR (and presumably USSSA) provides no penalty for taking signs from F2 off the rubber; it's a "don't do that." A quick pitch is an illegal pitch, of course.
2. Yes.
3. See above. FED and NCAA have the same rule, though the penalty is different (ball/balk in FED, ball in NCAA).
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Cheers,
mb
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