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ISF Rules (the ones used in the Olympics),
Rule 6, Sec.3 has nothing that prohibits this kind of pitch.
Eddie Feigner's legacy, I guess.
Sec. 3. LEGAL DELIVERY.
a. The pitcher must not make any motion to pitch without immediately delivering the ball to the batter.
b. The pitcher must not use a pitching motion in which, after having the ball in both hands in the pitching position, he removes one hand from the ball, takes a backward and forward swing, and returns the ball to both hands in front of the body.
c. The pitcher must not use a windup in which there is a stop, or reversal, of the forward motion.
d. The pitcher must not make two revolutions of the arm on the windmill pitch. However, he may drop his arm to the side and to the rear before starting the windmill motion. This allows the arm to pass the hip twice.
e. The delivery must be an underhanded motion, with the hand below the hip and the wrist not farther from the body than the elbow.
f. The release of the ball and follow through of the hand and wrist must be forward and past the straight line of the body.
g. Both feet must remain in contact with the pitching plate at all times prior to the forward step.
h. In the act of delivering the ball, the pitcher must take one step simultaneous with the release of the ball. The step must be forward toward the batter and within the 61.0cm (24 in) length of the pitcher's plate.
NOTE: It is not a step if the pitcher slides his foot across the pitcher's plate, provided contact is maintained with the plate. Lifting the pivot foot off the pitcher's plate and returning it to the plate, creating a rocking motion, is an illegal act.
i. The pivot foot may remain in contact with, or may push off and drag away from, the pitcher's plate prior to the stepping (non-pivot) foot touching the ground, provided the pivot foot remains in contact with the ground.
j. Pushing off with the pivot foot from a place other than the pitcher's plate before the stepping (non-pivot) foot has left the plate is considered a crow hop and is illegal.
k. The pitcher must not continue to wind up after releasing the ball.
l. The pitcher shall not deliberately drop, roll or bounce the ball in order to prevent the batter from hitting it.
m. The pitcher has 20 seconds to release the next pitch after receiving the ball, or after the umpire indicates, "Play Ball."
NOTE: An additional ball is awarded the batter.
Shmuel
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