Where would you stand?
 

There are 3 seconds left in the 3rd quarter. Team A has a throw-in on their end-line right where the 3-point line intersects the end-line. Team A has not been shooting 3's all game. This game is a JV boys with 2 officials.
Would you stand on the outside of the player? Thus standing beyond the sideline. This puts you about 20 feet away from the post players. Or would you put yourself between the basket and the player for the Throw-in?
I know the book says 'box-in the players'.

I would put myself between the basket and player.

I would stay on the outside. It is about angle not distance.

Peace

I'd stand on the inside. The thrower is likely to obscure any view you might have of a play that goes to the inside. Get the clearest angle/line to see the likely play.

This is how I was taught too.

How do you observe both the thrower-in and the players on the court if you stand on the inside?

Inside the player if the the official would be outside the 3-point line. Otherweise, outside the player.

So, in this play, I'd be inside.

There's not going to be much action way over on T's side, so T needs to expand his area to those players just outside the lane on L's side.

Inside.

Aren't you going to end up with L only being able to see the thrower-in and T trying to cover the other 9?

Not if the L is any good.

What do you do if A has the ball inbounds in L's corner? L doesn't (I hope) run out extra wide so s/he can be outside the play.

Or the sideline if they do go outside...

No, and that's a fair point. The big difference though is A1 is in front of L instead of beside him. With A1 beside L, L has to turn his head towards the sideline far enough to see A1 which means he's looking away from the majority of the court. With A1 on the court, L can see A1 while looking towards the far endline which lets him see the majority of the court.

L can back up a little. L will have a "corridor" from about L's position (perhapds 1/2 way from the lane to the 3-point line) out to the FT line extended. The angle might go slightly toward the sideline.

Back up and get as much depth as possible and use my peripheral vision to observe the thrower.

I think in two person you stay outside because you still have sideline responsibility and the play is not only going to be in the lane. You have to make sacrifices as you always do in a 2 Person system. In 3 that is easier to suggest to go inside when you have other sets of eyes on the sideline. I would be so afraid I would miss a sideline play on a throw in which is more likely than a play inside. It would be the same look and I would have help there. There is no help on the sideline IMO.

Peace