Now here's the major change we're going to make; in the Hit state, select your shape and then use the Free Transform tool to scale it out on all sides so that it covers an area larger than the clickable object itself. Remember, the Hit state isn't visible even if you make a standard button with visible states; this just defines the area that's clickable for this button's behaviors. What we've just done is made a little of the area outside of the visible object clickable, so the user doesn't have to be so precise in mousing over it.
Click here to see how it works.