Thanks again for all of your input!
To clarify my second question, I'm asking about the "cruise" regulated mode. In some longarms there's a "cruise" regulated, and a "precise" regulated. (In Bernina regulation, BSR 1 is cruise, BSR 2 is precise).
In the cruise regulated mode, the machine continues to stitch at a slower speed after you've stopped moving (this is supposed to make it easier to start moving again from a dead stop). On the most longarms with this feature you can set this minimum speed. I'm curious as to how fast or slow this should be, and if it is better to change it for certain types of stitching (stippling or small stitching, vs lager sweeping free motion movements).