Too many keyboard operations require either taking your hand off
the mouse
You could use a Trackpoint keyboard, where the "mouse" is in the center of the keyboard. That is my preferred solution to the world that thinks mice are good things.
or reaching across the keyboard -- important ones should be focussed on the left hand.
The ideal solution would be to do a GOMS study:
"Goals, Operators, Methods, and Selection rules, "
http://en.wikipedia.org/wiki/GOMS
-Dan
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