*  Make it a reusable .as system, or even a genuine class to attach to a movieClip, extending it.
This will require replacing its load-image component with a simple attachBitmap setup, which is all it actually needs.

Consider adding actual events alongside the externally-defined functions.

* Respect the "enabled", "visible", and "_visible" settings of parent components.

* Add an "enabled" setting to the drag-and-drop system itself.

