Check out this Glide keyboard from Weston Boege which also acts as its own mouse.
The idea is to let the wrists rest on the keyboard bottom where there are mouse buttons that you use on your fingers crossed.
Since Moving easily across the entire keyboard of the desktop because it sits an optical sensor under the keyboard, just like on the optical mouse at any time. The keyboard itself is based on four easy-friction feet that will allow smooth movement.
Dont worry the keyboard also has traditional mouse controls built into its moulded palm rest, which grips your hand as it moves.