IvanK - PAC isn't modeled in the A-10A, only the A-10C so you won't get any use of this.
EAC =- Enhanced Attitude Control System - again, not modeled for the A-10A (have a read of it's function on page 49 of the A-10C manual - if you don't have that module I'll send you a copy of the manual).
Seems that the new inputs were imported to bring some of the naming of the controls into alignment with the A-10C.