In addition to the objects stated in paragraph (f) of section 3 of this act, and in addition to those provisions which are elsewhere in this act required or permitted to be included in a plan, and without limitation as to the nature and scope of the provisions which a plan may contain, a plan may make provision for 1 or more of the following, to the extent that they are consistent one with the other:
(1) rights, privileges, options and benefits, to accrue or to be exercised by the employee, or by a beneficiary or beneficiaries designated by the employee, when employment terminates otherwise than by retirement, including provision for the payment of a death benefit if death occurs before retirement;
(2) the designation by the employee of a person as a joint annuitant, or as a joint and survivor annuitant;
(3) the designation by the employee of a person or persons as beneficiaries to receive payment of a sum or sums, or to exercise an option or options, after the happening, before or after retirement, of a contingency or contingencies specified in the retirement plan, including the death of the employee within a specified period after retirement begins, or the death of the employee after retirement begins but before the receipt by him of a stated or ascertainable sum in retirement benefits;
(4) the continued employment or re-employment by the bank of employees or former employees who are receiving retirement benefits under a plan maintained by the bank;
(5) any further provisions which the bank may choose to make, and which are not prohibited by law.