title: Qt mouse cursor transparency
body: <p>I would like to change the stock cursor with a translucent one, a simple filled circle, of various sizes, depending on the level of zoom in the underlying widget (say, RGBA = 200, 200, 200, 128).</p>
  
  <p>Is this at all possible with Qt? If not, is it a limitation in Qt or the underlying libs? Do you have suggestions as to how this could be accomplished by other means, e.g., hiding the cursor and overlaying a transparent pixmap at the cursor position (albeit slower)? TIA</p>