Question: Is the usual position of the keyboard, i.e. horizontal in front on the desk, actually a desirable position or is it just a hangover from mechanical typewriters?
Answer: In general, body joints like to operate in mid-range. Thus, despite the fact that gravity likes to pull our arms down, it’s a poor posture on the elbows. I’d much rather use forearm supports of some sort if needed. This idea of a split keyboard has been presented before and is also listed from surplus parts or “stupid nerd hacks”. After suffering symptoms of an RSI, I investigated “ergo” keyboards. It turns out that an “ergo” stamp is an excuse to charge truly absurd amounts of money of very common equipment. I also found that no one had quite what I wanted–a keyboard which allowed my wrists and arms to be in their relaxed positions, i.e. at my sides. What I imagined was, basically, a saddle-bag keyboard. This in mind, I visited a surplus computer parts store, and bought two keyboards for $7/each and then took a jig saw to one of them.