I’ve been scanning 50 year old slides and negative strips. Occasionally, a slide/negative is reversed; the emulsion is on the wrong side and a scan with text is backwards. I have the option of rescanning it or, if the option were offered, digitally “flipping” it, an option not offered in PL.
I have found a solution in Picasa. A file can be virtually flipped and copied producing a file correctly oriented.
I suggest a “flip” option be considered for PL. This was first suggested two years ago and should be reconsidered.