I also had a 1471 and I did use both the P and M (B00L00) memories. I need a picture of the stitches, but if you have a half scallop stitch that starts in the center - put it in M memory; flip stitch (upside down) and add that to M memory.
It will continuous sew. Otherwise, you will have to program half via B00L00 and save in P memory. Flip the stitch and add it, too.
The stitches HAVE to start in the center position.