Joyce, there is a way to have the presser foot automatically lift when you stop sewing, it's in the control panel settings. I keep mine under manual control but I've tried out the setting and it works fine. I like the laser, it's wonderful for walking foot quilting to keep from veering off the straight line. I also use the laser when sewing diagonal binding seams.
There are a few different ways to get a quarter inch seam, using different feet and different needle position settings. I've tried a few, you would need to find out what works for you. The fabric doesn't seem to pull away from the straight at the beginning and end of seams, which I've struggled with in the past. The Janome with the quarter inch foot and the special throat plate also works well for keeping the line straight all the way.
Babylock has lots of you tube videos demoing the crescendo, might be fun to look at some of those.
I definitely bonded with my Janome 6600, didn't really bond with the 8900 or the 9400, and I'm bonding with the Crescendo. It really comes down to spending some time with the machines and seeing how you like sewing on them. When I was debating over keeping the 9400 or getting the Crescendo, my dealer let me take the Crescendo home for a day to sew on it
. That helped me make the decision.
Have fun playing, it's a lot of money to spend on a machine but worth doing. You'll be able to do about anything with either machine! Kathy