i wonder if this has to do with the "backward" staggering of columns for the left hand, in standard touch typing. i find the asymmetry between left and right very strange.
Show Image
(http://geekhack.org/attachment.php?attachmentid=14862&stc=1&d=1295165343)
Does anyone type the way that image suggests? I physically can't. There's no way in hell I'm gonna reach z with my little finger, x with my ring finger or c with my middle finger without lifting off a couple of fingers from their home row positions. For starters, if I try to press C with my middle finger, it bumps into my index, so I have to lift off my index just to be able to reach there, but reaching there is really cumbersome and I have to move my whole hand.
I just press z with my ring finger, x with my middle finger and c with my index - much more natural movements, symmetrical with the right hand movements. I press B with my right index, I guess because I'm right handed so it feels more natural.