While I don't use her method I do prefer a non-hopping foot for FMQ if I'm doing very small, intricate curves, it's easier to get them nice and smooth if the foot isn't hopping. Both of the machines that I use regularly to FMQ prefer to have feed dogs down, stitch length doesn't seem to matter to them. I think it depends on the machine. Some of them do better one way and some another.
Rob