Customizing Shortcut menu?

I guess I could be missing something obvious here but is there a way to customize the shortcut menu (i.e. the options I get when I press the lighting bolt key)?

I'm currently thinking might be nice to have all my preset messages pop up there and able to send in a couple of key presses irrespective of what screen is up.
With a bit more use of the device I'm sure there's other things I might want to create shortcut for too if possible.