marginpar area with asymmetric option (geometry package) and \reversemarginpar
marginpar area is not sensitve to the asymemetric option of the geometry package. This option makes to have all the margin notes on the right side, even for twoside documents such as the book class. I would like to use (current marginpar area) when I have the notes on the left (that can be done with asymmetric + \reversemarginpar). 'asymmetric' set \@mparswitchfalse and \reversemarginpar sets \@reversemargintrue. The definition of (current marginpar area) should check this conditions.