I just watched a video in which the FMQ was done without a presser foot.  The fabric bounces a little but there is no obstruction of the fabric or pattern behind.  Also, "Schmetz" has a new needle with a spring that takes the place of our FMQ foot.  I'm ordering some to see how they work.  It's worth a try being able to see behind the needle is a plus when doing an intricate pattern or doing applique.