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A brilliant idea. The most productive I ever was at a machine was the early Daisy Logicians, used for chip design (so lots of graphical manipulation). This was in the early 80s so practically Stone Age. A regular keyboard for typing; a puck (think mouse) in the right hand; a set of 8(?) keys for the left hand, whose functions were context dependent. Amazing! Good luck.
More functions are still under development. If you have any good suggestions, you can also send them to us. Thank you !