The Illinois Administrative Procedure Act is hereby expressly adopted and shall apply to all administrative rules and procedures of the Department of Revenue under this Article, except that: (1) paragraph (b) of Section 5-10 of the Illinois Administrative Procedure Act does not apply to final orders, decisions and opinions of the Department; (2) subparagraph (a)(2) of Section 5-10 of the Illinois Administrative Procedure Act does not apply to forms established by the Department for use under this Article; and (3) the provisions of Section 10-45 of the Illinois Administrative Procedure Act regarding proposals for decision are excluded and not applicable to the Department under this Article to the extent Section 10-45 applies to hearings not otherwise subject to the Illinois Independent Tax Tribunal Act of 2012.