My stitch regulator doesn't have a stitch long enough to use for basting, and I haven't tried disabling the SR and driving fast, but I think I will try that if someone asks me to baste a quilt for them. (Not extremely likely since I don't longarm professionally, at least not at this time). What does work for me, but might not work for your customer, is basting with water soluble thread. That way the stitches dissolve when the quilt is washed and don't have to be removed as you go. Of course you also have to be sure that the quilt doesn't get wet while the quilting is in progress.