(1) Where a party sues or is sued as executor, administrator or trustee—
(a) it shall not be necessary to join as a party any of the persons having a beneficial interest in the estate or under the trust;
(b) a judgment or order in the proceeding shall bind those persons as it does the executor, administrator or trustee.
(2) Paragraph (1) does not limit the power of the Court—
(a) to order the addition of a party under Rule 9.06; or
(b) to make an order under Rule 16.01(2).