Windows Phone Thoughts: Universal Thumbboard

I'm a big fan of thumbboards. I have had one for almost every Pocket PC I've ever owned, and I'm a huge fan of the Treo form factor mainly because of its great thumbpad. The problem with thumbboards is that they add a bit of size to your PDA, but generally I don't mind because they provide an easy way of typing text when using my foldable keyboard is too much a hassle, like when there's no desk I can use. Another problem with thumbboards is that you'd have to get a new one every time you get a new device. So when I read about a universal thumbboard by Yondwin on Net PPC (Google autotranslate), I was quite happy since it could deal with one of those problems. When I read it used IR, I was in doubt. How did they do that? Well, they just add a little (....) bit more in size. 8O This monster is currently not available outside Taiwan. What do you think, should it be?