Code:
alias sendkeys {
  var %a = sendkeys $+ $ticks
  .comopen %a WScript.Shell 
  if (!$comerr) .comclose %a $com(%a,SendKeys,1,bstr,$1-)
}

alias scriptseditor { sendkeys $+(%,r) }


Then you can type: /scriptseditor, or make a button press trigger /scriptseditor