Section 2. The department shall, in accordance with section two of chapter thirty A and subject to appropriation, adopt regulations consistent with this chapter which establish procedures and the highest practicable professional standards for the reception, examination, treatment, restraint, transfer and discharge of mentally retarded persons in departmental facilities. Said regulations shall be adaptable to changing conditions and to advances in methods of care and treatment and in programs and services for the mentally retarded. Said regulations (1) shall include, but not necessarily be limited to, long and short-term residential care, educational services, and preschool clinical services, (2) shall define the levels of and other aspects of mental retardation as deemed necessary by the department, and (3) shall provide for different procedures for particular facilities or programs.