Under NCAA rules, the first statement is obviously true, and the second one can be.
There is Team Control during a throw-in (4-15-2c), however, if the throw-in is adjacent to the division line, an inbounds player in the front court not in control of the ball, may cause the ball to go into the backcourt.(7-6-8)

I guess I only wonder how much distance away they can be before they're not considered "adjacent" to the line.

That will be a question at our next rules clinic.