Make "long shadows" more generic
Operating System: (if feature is platform specific)
Description of the feature
The new "long shadows" feature (as I read the docs) allows solid color fill with variable alpha for the shadow as I understand it.
Wouldn't it be most generic if the shadow created were a "alpha mask" so that it could be filled with solid color or pattern (Shift+B), a color gradient(G), or be painted with an arbitrary tool?
Use cases
If you want to add a rainbow-like shadow...