in reply to The most useless key on my keyboard is:
Yuck, what a hard poll. The Mac key I (unfortunately) don't have, so that leaves me with one option less. The Windows keys I don't have (yet; old keyboard), but if I had it, I'd probably map it to something useful (why is it useless to Linux people???). The Esc key I use too much. Caps lock I sometimes use as Shift, when the Shift key is broken again....
I think I'll go for the Backspace button. Just have to get used (more) to the Readline vi Mode.
All code is usually tested, but rarely trusted.