Is it possible to use just the option key for a shortcut?

I'm using a Safari extension called HoverSee. I use it to temporarily zooming on an image, by hovering over it and pressing the option key, without actually clicking on it.
So my question is, is it possible to do this just with the magic mouse?
For the gesture, I choose the one-finger-tab, but I can not use just the option key for the shortcut.
Does anyone have an idea how I can solve this?

With Apple script, command keystroke

hm…good idea. But how should the script look like?
I tried it with this:
tell application "System Events" to keystroke { option down }
but it doesn't work.