Resistance:
Its kind of hard to explain, but for a demo:
Move your dual display to be set to the left instead of the right. Now, move your mouse to the middle of the Start button, and pause a second, and then continue moving it to the left. See how it stops instead of moving to the second monitor?
Well, I am looking for something like this, but that causes resistance on the entire left side (just a small margin) (But more over, something that you have to "Push" the mouse over to make it go past. That way, you dont accidentally move it past whatever you originally intended to point.