Software :: IPhoto 6 File Batch Rename?

I want to make sure that the file names in iPhoto are unique. For some reason, my digital camera was set to reset its file namer to start at IMG_0001 with every roll, so I have several dozen files with the same file names. Within iPhoto, it's generally not a problem, but if I need to work with a group of files outside of iPhoto, copy-dragging a bunch of photos across rolls to a single folder generally bombs out because of the conflicting file names. iPhoto doesn't seem to have any sort of file renamer at all, I can change the title, but that doesn't actually change the file name. I could and will now use the iPhoto exporter because it seems to do the trick, but sometimes that isn't as convenient as selecting a bunch of files and dropping them into my preferred folder.