Just wanted to say the same added functionality would make it perfect for me too.
And again I would be willing to chip in on development costs rather than having to mess around with flash myself.
My only slight modification would be to allow for either a further image enlargement or a link.
Maybe the xml file would allow per image either a enlargement or link data field.
eg. for an extra large image which could be used in a product page for example with the normal simple viewer showing thumbnails and normal view but then clicking on the magnifying glass icon goes to a full sized image. (although again this should allow for an image or a URL allowing us to link to a php/asp page containing the larger image for security purposes etc)
eg2. for a link off to other content relating to the image, clicking on a link icon to see the full story behind a photo etc.