funny you should post this today. i happened to drop off my machine for routine maintenance yesterday. i always take it to the shop where i bought it. so of course i was looking around at all the new toys.
they have a new accessory called INSPIRA FAB U MOTION. it even has a stitch regulator to purchase separately. they had it set up in the store and it looked like it would make free motion much easier. course it cost around $1100 with the stitch reg. it is by pfaff. i think you can use it with another brand of maching. it moves so smoothly i couldn't believe it. i have tried to post a link. if it doesn't take you there, go to the pfaff web site.
very interesting stuff they are coming up with. also pretty pricey.