i've hit R3, throw the ball away, while in the pocket, haven't got an intentional grounding call against me. it's only happen twice; the first was against the cpu, i had just snapped the ball, freaked out and threw the ball away. second was against someone on the internet, again freaked, got scared and threw the ball away immediatley.
Came in to say this. In real life, if you throw it in the direction of a receiver, even if it goes clear over his head and out of bounds, it's not intentional grounding.