Flash MX 2004.
frame.motionTweenRotate
Property; a string that specifies how the tweened element rotates. Acceptable values are "none", "auto", "clockwise", and "counter-clockwise". A value of "auto" means the object will rotate in the direction requiring the least motion to match the rotation of the object in the following keyframe. If you want to specify a value for frame.motionTweenOrientToPath, set this property to "none".
See frame.motionTweenRotateTimes.