I'm suffering from early RSI symptoms and am looking for a way to avoid injury. My physiotherapist has determined that the worst thing I seem to be doing is using my mouse at such a weird angle. The problem for me is, I keep my keyboard positioned such that my left and right forearms are angled in the same amount, i.e., my body is centred roughly with the B key. On my current keyboard, which is not a split, this means the wide Enter key, the arrow keys, and the number pad all jut out to the right before I have space for my mouse. I have a medium-width frame, but even still, this leaves my wrist at a really awkward angle when using the mouse. I'd prefer not to have to push my keyboard out of the way every time I switch between the two, but I do use the num pad occasionally, so I wouldn't want a keyboard without that.
I think it'd be ideal to have about a 30-50 cm space between the left and right halves of the keyboard, so my arms are more perpendicular to my collarbone, and the arrow keys and number pad in the middle, maybe even with the numbers on a 45 degree angle, so I could configure them for use with either hand.
(In case you were wondering, then a touch-screen with a stylus that has a right-click modifier button for mousing, because otherwise the mouse pad would be right where I'd put the right half of the home row, in the most natural position for my right arm while sitting.)
With that much space, you could fit so many custom keys for things that you normally use two-key combos for...or you could detach them completely (save for a wire) and just have, you know, actual desktop showing through.
What's the closest keyboard you've seen to this?