I make a lot of panos with PhotoMerge and often test them lo-res. It would be GREAT if the source file names or numbers could be saved with the resulting merge. That way it would be easier to go back and restich or refine. Is that possible? Thank you!
Have you looked into the the AutoStack feature of Bridge CS5? This does keep track of which files make up a panorama (and an HDR set, if you're doing those as well).
In Bridge, "Stacks > Auto Stack Panorama/HDR" searches the folder for Panoramas or HDR sets, and puts them in stacks. If it misses a file (or includes something it shouldn't) you can just pull the file in/out of the stack.
Then you can do "Tools > Photoshop > Process Collections in Photoshop", and go get a cup of coffee while it crunches all of your stacks into panoramas.
If you want to process just one stack of images into a panorama, you can click on the number at the top left of the stack to expand and select all the images in the stack, then do "Tools > Photoshop > Photomerge" to create a Panorama from it.
Yes, I have used 'Autostacks'. I often test or proof merges low-res and need a way to track which source images were used. After working low res and I'll return days or weeks later to create the high-res panos, which is why identifying the source files via metadata or naming would be so helpful.