I told them that was not a good option, but they added it anyway.
You can do one of two things. The first is to hold on to the window until you know it is not going to maximize. The second is to turn it off in the Ease of Access Center (make the keyboard easier to use-Make it Easier to Manage windows). The second option turns off all the snap.
You do know that you can maximize the window vertically only by dragging the top or bottom of a window to the edge, or show the double arrow on the top or bottom and double click.