After wasting a bunch of time reading about all the others having trouble with the Precision Touch pads. This is what I have leaned.
There are no setting controls under control panel/mouse. Instead the control are part of the windows 8.1 operating system. So on the start screen gear symbol, computer and devices, mouse touch pad. There you will find some limited controls for the touch pad.
In my opinion this system makes these notebooks unuseable. It is another case of taking something that works and changing it for the worse. There is no talk of changing this so if would be if and when or never.
I am voting with my feet on this one and returning two of these machines and likely crossing Acer off my shopping list.
Best of luck.