I'm dreaming of a keyboard where the touchpad would be placed in the middle between the two halves for left and right hand. Because arms aren't growing in front of people's bodies (as e.g. Kinesis well know). Still waiting for which manufacturer has this idea first.

But the thing in the post might be a better solution if both the keyboard and the touchpad work well. A great illustration of the classic principle: good design compromises in a contradiction, clever design eliminates the contradiction.