Is the pixel size of the embedded data even available to PM?
What about the 'version' name stored in the NEF. Is this something available to PM and therefore something that could be made available in a variable. I realize that 'version' can contain multiple names and is therefore not unique. Maybe the variable should simply tell us if version if empty or not. At least I'd be able to tell if the image has multiple post-processing flavors.
Yes the width, height, and size of the embedded JPEG is available to PM. It would be hard to render otherwise.
Try the {software} variable for your last issue.
-Kirk