Two actions, anyway - that doubles the work. I've seen similar projects in the news. It's just a GUI, nothing new.This way you could even reduce the number of keys just by adding a "letter/symbol" modifier.
The fact is why a standard QWERTY keyboard works is in its hexagonal structure - the keys are in the right places where the fingers are moving (it's like when you untighten the fist - the fingers are moving like rays - four fingers for ten-finger method - three fingers - three standard keys - the width of them is 54 mm - in a cell computer). The rectangular arrangement of the keys is worth only for entering numbers as in a standard computer keyboard's numeric keypad or phone numeric keypad. All the existing implementations of mobile keyboards have *straight lines* of keys - so there is no any signs of the system of typing - just by one finger or by two thumbs. So it's tiresome for more than five minutes of continious work. It's like that all these mini and reduced copies of a standard keyboard are produced just by inertion - for 10 years, at least - only by wishes that sometimes it will work like its original, or at least half of its productivity. No magics. Hexagonal arrangement is the key. Like in 1874 in a Remington typewriter (http://home.earthlink.net/~dcrehr/firsttw.html).
But there are wonderful exceptions - HP Jornado 680/690/720All the existing implementations of mobile keyboards have *straight lines* of keys
http://www.amazon.com/gp/product/B00...lance&n=172282
http://www.pocketpcmag.com/_archives...Jornada720.jpg
"It is possible to touch-type even though the keyboard is very small."
http://www.to-tech.com/mz/windowsce/hp720-review.html
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