The Illinois Administrative Procedure Act is hereby expressly adopted and shall apply to all administrative rules and procedures of the Department under this Law, 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)(ii) of Section 5-10 of the Illinois Administrative Procedure Act does not apply to forms established by the Department for use under this Law, 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 Law to the extent Section 10-45 applies to hearings not otherwise subject to the Illinois Independent Tax Tribunal Act of 2012.