A larger clickpad could make it possible to use multi-touch without having a multi-touch screen. This embedded video below shows the Synaptics ClickPad experience on Windows 8. In many scenarios, this approach makes a lot more sense than touching the screen itself. For example, I have to stretch to touch my screen. My keyboard, is "at my finger tips!"
You get a good view of the multi-touch capability about a minute and 15 seconds into the video when they draw with five fingers at once. At about 2 minutes and 28 seconds, you see two images being manipulated at the same time with multi-touch as well.