Aside...
Datahand moved RSI pain from my wrist to my knuckles. These keyboards don't magically prevent all RSI, which is ... only obvious if you actually think on it, which i didn't back then.
I know I personally found mouse keys unusable for day to day use, and another local DH users thought much the same, we had other pointers we used. (I used a fingerworks trackpad back when, clamped onto the side of the laplander, the other guy used a mouse, if I remember right.)
The amount of time wasted moving my hand from one keyboard-half or the other to the mouse and back was very substantial, and it meant compromising on a comfortable position of both.
Svalboard is way more comfortable!