I attempted to add a feature where the toolbar could be hidden. Hiding it is actually not all that hard. Making an obvious way of getting the toolbar back is the hard part. Microsoft has made it very difficult to add custom widgets to the frame of a window since Windows Vista (we would need some visual button that the user can always see that would allow them to get the toolbar back.) If there is no visible way of getting the toolbar back then we will be overrun with users calling our support lines, emailing us, posting on the forums when they accidentally hide the toolbar and don't know how to get it back.
-Kirk