I sometimes do the Betty Cotton Theory quilting and I always use my walking foot for the decorative stitches. As long as your foot has a wide enough opening for the stitch you select to zig and zag with you can use it. This method needs a walking foot because you are quilting four thicknesses together with a decorative stitch and a regular foot wouldn't keep the fabric feeding at the same pace. I hope this makes sense to you.
Good Luck
Suzy