This sure is interesting as I can backstitch with my IDT on my Pfaff and also on the walking foot for my Juki and vintage machines.....never had a problem whatsoever. I wonder if it is just certain walking feet that don't have the capablility to backstitch? Strange but interesting and I've never had to change the stitch length either. :roll:
I have also machine stitched on both sides of my quilt first to the back and then fold over to the front without any problems either....probably more of a personal preference as we quilters seem to have a lot of them. :-D