I used my Touch Pro2's keyboard for a couple of things other than typing. With the tilt, it made a fanstastic media stand, though if you remember, back in those days video on mobile was less smooth than today. The TP2 had some support for hardware decoding, but it was hard to access. If I used any app other than the awful bundled winmo media player, it was horrendous. Now the support is fantastic, and video is one of the most efficient things processors do. You use more battery reading a book than watching a movie these days.
I also used the keyboard to read. I held it in portrait with the keyboard out and tilted, like a book. I had my thumb over the arrow keys, and used them to turn pages. Most comfortable ereading experience I ever had.
And of course, it was the best mobile keyboard ever made. It was a joy to type on. The only good thing about on screen keyboards is using them caused prioritizing of text prediction. Swiftkey is particularly good at that. Of course, you can use text prediction with a physical keyboard too.