NBE Rulez Designated Spot ??

[APG]

Here are two case book plays that are pertinent to your question.

NBA Case Book (2010-2011)

346. While attempting a throw-in following a violation, Player A1 takes more than one step, jump or stride from the original in-bounds spot before releasing the ball. Is this a violation?

Yes. On a throw-in, Player A1 is allowed no more than one step or stride as in normal passing movement.
RULE 10 - SECTION III - a (4)

347. On a throw-in, what determines the distance between the defensive and offensive player involved in the throw-in?

The defensive player must allow the offensive player ample room to make the throw-in when the area out-of bounds is restricted. If there is no restriction of the area out-of-bounds, the defensive player shall be allowed to come up to the edge of the line, making certain that his arms do not break the plane. The offensive player may back off to allow himself as much space as possible without leaving the surface of the court.
RULE 8 - SECTION III - a
RULE 10 - SECTION III - a (8)