"Not interfering with play" has always been part of the laws, what Fifa have done is try to define what this actually means. If you remember the offside traps of the 70s and 80s, they made football very tedious - this was the result of the idea that anyone in an offside position is offside...
It's allowed. From the current Laws:
"If a player, while correctly taking a throw-in, intentionally throws the ball at an opponent in order to play the ball again but neither in a careless nor a reckless manner nor using excessive force, the referee allows play to continue."