Hi DrO,
another idea. What about changing the icon of a smart view. That can already be done to a certain expanse, by loading a preset and then modify the request, but this approach is very limited, and not very easy to use. Why not adding a whole set of icons, and the possibility to explicitly choose from this set? I know I would use this feature. You could also add the possibility to select external icon.
And even better if it could be done for playlists too!