FMQ would help when quilting as you could quilt over the seams too. I never stitch in the ditch, I don't think it helps anything. I quilt about a 1/4" from the seam, usually where the seam allowance is. I try to make sure I don't have any skimpy seams after I sew a seam. Easiest to fix then. I set my machines stitch length on 2.