I have the Cruise Control hooked up to my Juki TL-98 QE. Not sure what the "extra" thing with Viking is. The only time I had a mess on the back was when I forgot to lower the presser foot. Mine only runs as fast as I want it too. I move the machine at my own comfort level and control the speed of the machine with my hand held button. By placing calls to Cruise Control and Viking you should be able to solve your problems. Be sure the rollers have not jumped of the rack! That is when I would get very long stitches. Never heard of the Mega Quilter.