Sometimes when I want to use my n800 one-handedly, I just bring up the full screen keyboard, and hold the device sideways, and I have all the characters on the right side of the screen.

Though it is annoying to have to see all the characters sideways, but my thumbs can reach them all.

If we can just re-use that keyboard, and just turn all the keys 90 degrees, at least that would be a start.