Horizontally scroll with shift + mousewheel

shift_mousewheel_hscroll.ahk

; Shift + Wheel for horizontal scrolling
+WheelUp::
    ; Scroll to the left
    MouseGetPos,,,id, fcontrol,1
    Loop 8 ; <-- Increase for faster scrolling
        SendMessage, 0x114, 0, 0, %fcontrol%, ahk_id %id% ; 0x114 is WM_HSCROLL and the 0 after it is SB_LINERIGHT.
return
+WheelDown::
    ;Scroll to the right
    MouseGetPos,,,id, fcontrol,1
    Loop 8 ; <-- Increase for faster scrolling
        SendMessage, 0x114, 1, 0, %fcontrol%, ahk_id %id% ;  0x114 is WM_HSCROLL and the 1 after it is SB_LINELEFT.
return