AutoHotkey can do what you want + MORE 
- Install this
- RMB on your desktop>New>AutoHotkey Script
- Rename the file to AHK_mp3tag.ahk for example. Just make sure the extension is .ahk
- Double click the newly created file.
This AHK_mp3tag.ahk file could be loaded very time windows starts.
Just hit win+R key and type shell:startup and paste that file in there and you should be good to go. Or if you had trouble like me in the past with win 10 use shell:Common Startup instead.
See notes for usage.
;
; Mp3Tag - Re-mappings and custom keyboard short-cuts by stevehero
; Allowing custom keyboard short-cuts ONLY while the active windows is Mp3Tag.
;
; ALT+M, Global hot key to suspend all of these keyboard short-cuts.
!m::Suspend
;
; Short-cut: ALT+6
; Remap Alt+6 to automatically accept the next pop-up dialog
; The dialog is still available by clicking it on the toolbar.
; This short-cut merely avoids having to click OK.
;
#IfWinActive ahk_exe Mp3tag.exe
!6::
Sleep, 400
send, !{6}
send, {enter}
Return
#IfWinActive
;
; Short-cut: CTRL+N
; Remap TRACK Auto-Renumber
;
#IfWinActive ahk_exe Mp3tag.exe
^n::
Sleep, 500
send, {LAlt}
send, {o}
send, {Down 1}
send, {enter}
; This next line accepts the AR dialog
send, {enter}
Return
#IfWinActive
;
; Short-cut: CTRL+T
; Quick RMB Tool Context menu
; If you want this to fire up a tool in mp3Tag, then rename
; the tool to have an ampersands in the name to represent the last button pressed.
; e.g. '&Youtube Search' (see {y} below)
;
#IfWinActive ahk_exe Mp3tag.exe
^t::
Sleep, 400
SendInput {control down}{shift down}{f10 down}
SendInput {control up}{shift up}{f10 up}
send, {t}
; Line below is optional. Here you can fire up the tool using the letter represented by the & in the tool name.
; send, {y}
Return
#IfWinActive
;
; Short-cut: CTRL+SHIFT+S
; Works only when explorer.exe is the active window.
; Taken from AHK forum from user jeeswg: https://autohotkey.com/boards/viewtopic.php?p=160589#p160589
; Many thanks for that
; Change the path to whatever path your Spek.exe lies.
;
#IfWinActive, ahk_exe explorer.exe
^+s::;explorer - open selected file in SPEK
Clipboard := ""
Send, ^c
ClipWait
vPath := Clipboard
if !FileExist(vPath)
return
WinGet, hWnd, ID, Spek - ahk_class wxWindowNR
if !hWnd
{
Run, "C:\Program Files (x86)\Spek\spek.exe" "%vPath%"
return
}
WinActivate, % "ahk_id " hWnd
WinWaitActive, % "ahk_id " hWnd
PostMessage, 0x111, 5000,,, % "ahk_id " hWnd;WM_COMMAND
WinWaitActive, Open File ahk_class #32770 ahk_exe spek.exe
WinGet, hWnd2, ID, Open File ahk_class #32770 ahk_exe spek.exe
ControlSetText, Edit1, % vPath, % "ahk_id " hWnd2
ControlClick, Button1, % "ahk_id " hWnd2
return
#IfWinActive
You've got 500millisecs (half second) in which to hit the commands and lift off or else the code won't fire.
Reason for edit: Added additional code and added a suspend script to ALT+M.