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I have looked at a lot of big machines, never owned one really but it always looks like a problem to me. My brother in law bought a big industrial Juki sweat shop machine and quickly found out it was totally unsuitable for what he wanted, way too fast. I have been thinking a lot about a way to control the speed on one. A rheostat controlled motor is one choice but they never seem to have much power on slow. Another Idea I had would be a sort of transmission that had a rubber tire running on a spinning disc. The farther the tires moves out the disc, the faster the machine goes. I even have an old 29 series Singer I was thinking about experimenting on.
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