Thank you to everyone who responded. I will look up some of the terms you used, and talk to my dealer. I have already committed $300 for a lightweight machine, but I tried it (as suggested) in dealer’s shop, and it won’t work. I doubt I’ll do piecing or embroidery in the foreseeable future, but continue to make simpler (and smaller) quilts and quilted objects. Most of the machines with speed control, accufeed, adjustable pressure, and stitch regulator seem to have too many stitches!
If you look at the Juki TL 2010, it doesn't. No stitch regulator though. The only machine I own that I can get a speed regulator for is the Bernina 475. I don't have one. WAY too expensive.