As a person with some knife throwing expirience, i can definitely say that quick throw(from the belly with no shoulders rotation) will deal significant damage on a distance about 2m. Considering the wrist movement trajectory on such technique, you can't surely predict impact point and knife rotation at a greater distance. For more distance precise throw swing is absolutely necessary. There are 3 most commonly used types of it, having different trajectories - from same shoulder, from the opposite shoulder, from the opposite shoulder over head. Each of them proves, that longer swing time leads to more accurate and powerful impact. Only alternative is, as mentioned before me, to keep hand with a knife at swing start all the time.
Throw speed and knife speed you possibly get used to via CoD is not realistic, at first, at second - such TK performance would ruin balance more than april fools mozambiques.