Leah Day did have a fix for a FMQ foot that turned a hopper into a glider. I'd assume a bought foot would do the same, except I haven't seen a manufactured one except for the ruler ones.
I have 3 different feet. I did the Leah Day thing with a plastic foot and rubber band, I had bought a true open toe for the 1500, and the Juki has the 1/4 and 1/5 feet. The Juki apparently are adjustable.