Hi Samuel,
I've incorporated your changes, refactored, cleaned up and documented all methods of ScreenShotMorph. I've also repackaged it as a monticello package. It's available at:
http://kilana.unibe.ch:8888/ScreenShotMorph/ScreenShotMorph-tbn.1.mcz
and on SqueakMap. It's now also possible to get the morph from the objects tool.
Bye Torsten