I suggest use this sort of hotkey layout i made.

I was having issues when i help 1 button it was queing up the same button over and over, so i made this to counter that, lol as u see i have my numpads binded to my G15 G keys .

~Numpad0::
IfWinActive, World of Warcraft
{
ControlSend,,{Numpad0 down}, ahk_id %wowid1%
ControlSend,,{Numpad0 down}, ahk_id %wowid2%
KeyWait Numpad0
ControlSend,,{Numpad0 up}, ahk_id %wowid1%
ControlSend,,{Numpad0 up}, ahk_id %wowid2%
return
}