This is what worked for me. I don't know if the Persistent call is required, but it works. Everything else I had to put in or it wouldn't work. If you don't want coin buttons 5 and 6 to start a game you can leave those out. Also, I compiled this to .exe using the tool that comes with AHK, that worked better for me for some reason.
;
;This script is to use either coin up button, either start button or either fire button to start a game while in MaLa.
setTitleMatchMode, 2
DetectHiddenWindows,on
#IfWinActive, MaLa
#Persistent
2::1
5::1
6::1
return