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The ruelbook has this section on withholding the ball from play...
Withholding Ball from Play
SECTION 13. When a loose ball is on the ground, a player may not lie on the ball, trap it with his crosse longer than is necessary for him to control the ball and pick it up with one continuous motion, or withhold the ball from play in any other manner. Note: A player in possession of the ball who holds his crosse against any part of his body, thus preventing the normal dislodgment of the ball, is illegally withholding the ball from play. The glove hand cannot grasp any portion of the head of the crosse.
This is intended to cover faceoffs and a player in possession of the ball who is “thumbing” the ball or choking up and grasping the plastic portion of the crosse.
A "few" years ago at the NCAA rules clinic, enforcement of this was a Point of Emphasis. the thinking was that if the hand was kept off the plastic it was virtually impossible to reach up and "thumb" the ball. Since then you rarely see this call made, and you see a lot of players cradling as in the picture above. My feeling is that it gives an advantage -at the least helping to absorb the shock of a stick check, and at most allowing a little hankie-pankie on a tight roll dodge.
What are your thoughts? Do you cradle this way? Do your opponents?