I'd like to suggest an extension to the "copy outline here/copy fill here/copy all properties" menu items you get when you right-click and drag one shape to another.
o "copy outline to fill" - copies the outline color of the first shape to the fill of the second shape.
o "copy fill to outline" - copies the solid-color fill of the first shape to the outline of the second shape.
o for extra fun, this can make the outline the same color as the fill, or vice versa, when a shape is right-clicked and dragged to itself.