#include <Misc.au3>

Opt ("MouseClickDelay", 1)
Opt ("MouseClickDownDelay", 1)

HotKeySet("{ESC}" , "close")
HotKeySet("{SPACE}" , "startpause")

Dim $click = False

Func close()
    Exit
EndFunc

Func startpause()
   If $click = False Then
      $click = True
      ToolTip("Running." , 0 , 0)
   Else
      $click = False
      ToolTip("Paused." , 0 , 0)
   EndIf
EndFunc

;main loop
While 1
   If $click = True Then
    MouseClick("left")
   EndIf
sleep(1);had some issues without it. you can try disabling this line
WEnd