No motor vehicle liability policy other than that defined in N.H. Rev. Stat. § 259:61 shall be issued with respect to any motor vehicle registered or principally garaged in this state, either before or after requirement of security and proof, by any authorized insurance company, except that such an authorized insurance company may issue and deliver what is known as a Standard Automobile Liability Policy by having attached thereto an indorsement meeting the requirements of this chapter, such indorsement to be in such form as the insurance commissioner shall prescribe and to be known as the New Hampshire Statutory Motor Vehicle Liability Policy Indorsement. The insurance commissioner shall approve such policy, indorsements and binders as shall meet the requirements of this chapter, and may, from time to time as he may find the public good requires, change the form and provisions in policies, indorsements and binders and the terms and conditions thereof.