Been using the plug-in a bit and added some  features and made some changes (some of which change the resulting output to the previous version.)

changes v1.1

1. Added a Flip X, Flip Y and Rotate option so it is possible to flip the mapping image or rotate it in 90 degree steps (these operations happen before the cropping feature.)
2. Center Position X-axis inverted so it now is easier to place your mapping image.
3. Alpha is used as well now (this one seemed to have slipped through and i noticed it only till the last job.)
4. When using a 8/16-bit integer image as UV map now works as well (not sure why you would want this, but hey, better save than sorry.)

visit the original post to download the latest version.