A transferor shall have only the powers and rights conferred by the qualified disposition trust. The powers and rights conferred by the qualified disposition trust upon the transferor are personal powers and rights that may not be exercised by a creditor or any other person, except as expressly permitted by the trust. Except as permitted by Sections 91-9-717 and 91-9-721, the transferor shall have no rights or authority with respect to the corpus of the trust or the income from the trust, and any agreement or understanding purporting to grant or permit the retention of any greater rights or authority shall be void.