Any beneficiary of a trust affected by this chapter may, if of full legal capacity and acting upon full information, by written instrument delivered to the trustee relieve the trustee as to such beneficiary from any or all of the duties, restrictions, and liabilities which would otherwise be imposed on the trustee by this chapter, except as to the duties, restrictions, and liabilities imposed by sections 1093–1095 of this title. Any such beneficiary may release the trustee from liability to such beneficiary for past violations of any of the provisions of this chapter.