I have a 2011 Macbook Pro, and when I'm typing my palms cover the upper corners of the touchpad, and frequently touch at the same time. It seems palm detection isn't working, or possibly a small enough portion of my palm touches the corner so that it registers as a finger. At any rate, I frequently get a two-finger scroll action occurring as a result of this, which can lead to some very annoying results while typing text.
It seems to me that a two-finger scroll should only be registered if the fingers are somewhat close together, not at opposite sides of the pad. Is there a setting for the synaptics driver that I can change this behavior?