Although my (ahem) modern Janome has a 9mm slot throat plate with the wider teeth setting that this entails, I don't have too much trouble using the 1/4" foot. However when doing my first miniature quilt last month, I ended up using my old treadle which is a straight stitch only and I found it much better for feeding the fabric (starting & stopping was interesting - it probably needs a good oiling, and a lot more practice
but it did feel good to work on)
Sorry really don't know about Berninia's and I have rather lost track of all your different feet and do-dads - Lois I guess you had better carry on with looking for a treadle....