Right, there's no depth limitation either way. :)

Yes, IF you were calling according to a rule book from sometime around 1982. That was changed many years ago so that presently the answer is no, and has been "no" for some time.

No, the word is 'waved'. ;)

I disagree. The designated throw-in spot is entirely OOB. If the thrower does not have one foot over the OOB area, then he does not have at least one foot on or over the designated throw-in spot. I'd call a violation.

I don't work, just play, but would think traveling, unless it's after a made basket.

The traveling and dribble rules are not in effect during a throw-in.

4.42.6 SITUATION: Following a personal foul by B3, the official indicates to
Team A that they shall inbound the ball from a spot 10 feet from the sideline. In
(a), A1 jumps in the air, over the designated spot, and passes the ball inbounds;
(b) A1 has one foot within the designated-spot area but lifts it from the floor as
the inbounds pass is made; or (c) A1 moves directly backwards from the designated
spot by 6 feet and passes the ball inbounds. RULING: Legal in (a), (b) and
(c). As long as the thrower maintains any portion of his/her body on or above the
3-foot designated-spot area while making the throw-in, the throw-in shall be
legal.

LEAVING DESIGNATED SPOT
7.6.3 SITUATION: A1 is out of bounds for a designated-spot throw-in. The
administering official has designated the spot and put the ball at A1’s disposal. In
order to avoid some of the defensive pressure near the throw-in spot, A1 takes
several steps directly backward, but keeps one foot on or over the designated
area prior to releasing the ball on a throw-in pass. RULING: Legal throw-in. It is
permissible for the thrower to move backward or forward within the 3-foot-wide
designated area without violating and he/she may move laterally if at least one
foot is kept on or over the designated area until the ball is released. The thrower
may also jump vertically and pass from the designated throw-in spot. COMMENT:
Pivot-foot restrictions and the traveling rule are not in effect for a throw-in. The
thrower must keep one foot on or over the spot until the ball is released.

What do you think now?

I think that he can move both backward and forward just as I did before.
What I do not believe is that he can jump forward beyond the boundary line such that no part of his body is over the OOB area of the throw-in spot prior to releasing the ball on the throw-in pass.

The wording that you note is there to clarify that the thrower can back up and then return forward again if desired. It does not state that he can jump over the line.

It also does not state that he can't. The only stated limit to the throw-in spot is its 3 foot width.

Don't overlook the restrictions imposed by these sentences:

"As long as the thrower maintains any portion of his/her body on or above the
3-foot designated-spot area while making the throw-in, the throw-in shall be
legal."

"The thrower must keep one foot on or over the spot until the ball is released."

Do you believe that the throw-in spot extends to the inbounds area of the court? Can a player legally make a throw-in from inbounds? ;)

Right. The throw-in must be made from out of bounds. As long as he throws it before he comes down, he's still out of bounds. Meanwhile, he hasn't left the throw-in spot, because its only restriction is its three foot width.

My point was that if he can't legally stand there and throw the ball, then he can't throw the ball from above that location either as he wouldn't be keeping a foot on or over the spot.

Please think about that for a bit and then post your thoughts tomorrow.

My thoughts are that the whole point of the throw-in spot is that the thrower can't move along the line.

My initial thoughts were that the definition of the spot precluded a player from engaging in the play I mentioned. After reading the wording, however, I have to change that opinion. The fact is, there is no specific wording that prevents the action. I don't believe there is signficant enough advantage gained on this play to warrant calling a violation without specific rules declaring it illegal.