irishrose

You don't need to add any stitching to the finished quilt. I can't give you a good answer to your question because the machine I have a walking foot for can't quilt and my quilting machine doesn't have a walking foot. I love the SITD foot for SITD. That little plow just keeps the stitching so straight. I lessen the pressure on the presser foot if it's a thick batting. Personally, I find the walking foot slow and noisy, but I do use it if I feel I have to zigzag around a quilt before I bind it.

Edit: I do not SITD a quilt before I FMQ it unless it's part of my quilting design. Once it's pinned, it's not going anywhere. The only place I consistently SITD is between the border and the quilt as I sometimes have a slight space there. Plus, I like the frame it gives.