ANSWER: This is not permissible as one would deliberately go agains the Sunnah for no justifiable reason!  Sujood As Sahu (Prostrations of Forgetfulness)

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ANSWER: They can stand and move around if they want! 

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ANSWER: In silent recitation, there is no sound coming out and there is no articulation of the letters! Therefore, Satan uses his tricks to confuse those who are ignorant that they didn’t pronounce the letters correctly! Ignore such whispers 

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