[refguy]

Originally Posted by Nevadaref

You may do things differently in your local association, but here are the NFHS answers to your questions.
1. That means if the ball goes deep into the backcourt, not just near the division line. If the tap gets knocked into the 3pt arc or below the FT line extended, then the U has to run down there to cover the play. Someone may foul or the ball could go OOB and a decision can't be made by the R from midcout. In such cases it makes sense for the U to become the Trail and start a ten second backcourt count.
Don't hung up on the wording and confuse the above with clear control being established less than ten feet in the backcourt and all of the players moving towards the other end. In that case the U needs to go be the Lead.

2. Which players that text says for the officials to observe is no longer valid. You are correct that the players moving up a spot changed this a bit. The two officials still cover the shaded areas in that diagram. It's just that the players are now in different spots. So the Lead has the three marked lane spaces OPPOSITE him, and the Trail has the FT shooter and the three marked lane spaces OPPOSITE of him.
PS With the new mechanic for the coming season the diagram will be a mirror image of the actual coverage.

3. In 2-man if the Lead gives a preliminary signal becaue the try was attempted from his primary coverage area, then he also gives the "touchdown" signal on a successful three point goal.
In 3-man the Lead may sometimes need to help by giving a preliminary, but never gives the "touchdown" signal.

You must give the touchdown signals if the trail and center fail to. If not it becomes an official's error and not a scoring error.