Well, if you don't need to resize the image and you don't need the
drag-n-drop feature, then you don't really need a script at all since
exiftool will already process an entire directory of images (or an
entire directory tree with the -r option).
But to save typing, you can put all your arguments in a file
(ie. "file.args"), and use a command like this:
exiftool -@ file.args DIR
You include all of your tag assignments in "file.args", plus you can
add -ext JPG to process only JPG images, -r to
process subdirectories too, and -overwrite_original to avoid
creating the _original files.
- Phil