Thanks Dave,
My Epson does the same thing with separate images placed on the glass. A feeder is more efficient in that I can plop down a bunch and go about other things while they scan.
I've managed to rig the feeding path to accommodate 4x6 photos, but only about about 4 per minute. I've been looking at a Kodak model that will do about 18 per minute and has a track built to handle the 4x6s already.
If my friend wants to pay enough in advance to get the scanner, I may spring for it and drop her price a bit. We'll see. There are certainly enough photos for me to do it that way and still make quite a bit before the whole thing is done.