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Situation 1

Are you saying that F1 can actually start off with his left shoulder directly pointed towards first at the point that he comes set?
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Situation 1

Actually by open I mean his foot is slightly closer to first than normal. This makes it easier to see first. Imagine his lead foot directly in line with the plate. Now figure how much he has to open his shoulder to see the runner and move that angle down to his foot. It's usually only about 6 inches off line.

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Situation 2

What does it mean to break the rubber? Does it mean that he can't have any part of his foot on the rubber when he fakes the throw to third? It always appears to me, looking from home plate, that the pitcher has at least part of his foot on the rubber when he does the third-to first pick off move.

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Situation 2

In the normal third to first move the fake to third is enough to pull his foot off the rubber. Then the move to first is done by a pitcher that has turned himself into an infielder hence no balk. I believe he can make a good fake to third and in a seperate move throw to first while still engaged. If he stays engaged he has to throw to first, he can't fake.
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Situation 4

According to Fed 6-2-4b he has to either throw or feint a throw to the base. Am I misunderstanding this?
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Situation 4

No, but if watch a major league pitcher many times his feint is nothing more than stepping over the rubber towards second but no actual move with the ball.
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Situation 5
What I mean is as follows. B2 breaks towards second. He is halfway between first and second when F1 steps directly towards him. Is this step legal since it is towards the runner and not the bag?
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Situation 5

No I would say he would have to break the rubber then play chase the runner.