Allow "Swipe two from the left trackpad edge" to perform other tasks

[upstroke-version]

Currently, "Swipe two from the left trackpad edge" gesture only allows few actions like adjusting volume or brightness. It would be great if the Gesture could just triger other actions like keyboard shortcut, which most other Gesture allows, after detecting gesture. No need to detect the length of the swipe in these cases.

[rxhanson]

Thanks for the feedback. I'll see what I can do next time I'm around that part of the code.