West Palm Beach Firefighters Pension Fund, Palm Beach County; Revises definitions relating to West Palm Beach Firefighters Pension Fund; board members' credits for service; revenue; member contributions; custodian of funds; investments; service benefits; supplemental pension distribution; optional forms of benefits; share accounts; deferred retirement option plan (DROP); backwards deferred retirement option plan (BackDROP); disability pensions, medical examinations, return to work; beneficiary benefits; review procedures; Internal Revenue Code limits; minimum distribution of benefits; rollovers from qualified plans; & prior firefighter service.