I had forgotten about the Thumb Keyboard because I have a Windows Phone and use the Word Flow keyboard.
As I result I don’t have much experience typing with my thumbs. I really hope that this feature finds its way into a future release of Windows.
Back to the present: I recently got an HP Stream 7 and it’s a perfect size to use the thumb keyboard.
Unfortunately I can use the Windows-Volume-Down* trick to take a screenshot of the onscreen keyboard or I could show you how well that onscreen thumb keyboard looks on a 7 inch screen.
See more forgotten Surface Tricks in the Surface Blog
* Press and hold the Windows button, and press down on the lower volume button on the side of your Surface. Your screen will dim a little for a moment when you do this. Your screenshots will be saved their own separate folder inside your Pictures folder.