Well i got a even easyer sollution,
if you have a corless mouse, just make sure you can get the bateries uit, pres the right button and ceap it in. When you remove the bateries now, the mouse won't work but the pc thinks you ceap the right button in. So very simple and doesn't spends your bateries.
And for the persons with cord. Just unplug it

of cource while holding down right button.