I'm redesigning the stamps as part of the overall annotations redesign. I'm already planning on switching to using fonts for stamps as part of that instead of bitmaps, so that is vector-based. I'm planning also on letting users provide their own bitmaps or vector graphics for custom stamps. For crescendo/decrescendo and other stamp types that require a dynamic size, I'm going to create a new mode for that. If you look for posts about the changes planned for the annotations redesign, you will see mention of these and other big changes.
Mike
Mike