I don't think such a keyboard will be optimal for normal usage on most application, because it's slower and more error prone to press two keys at a time instead of one.

I do however suggest you check out the Vim editor with the Colemak mappings. When you use the Vim editor you don't need to move your hands off the home position to navigate around the file.

Shai, thanks for quick and informative answer =) Today I tried Vim first time :)

Some new idea... Shai, you are right, "accord" keyboard is not optimal for usual text typing. It's better to have a powerful text-editor. Vim is good, but not ideal. As I have understood, you have to press escape key too often.

It's possible to create an editor, which understands Colemak/Dvorak/Qwerty and/or some other layout but prints a char only when you release this key. And if you have pressed a key, but have not released yet, this key works as modifier. So you can type texts as usual, but you have the ability to press some specific keys easier, such as arrows or numbers or signs as em dash (Alt-0151).

For example arrows could be accessed by permanent pressing of 'N' key and pressing keys F, S, R, T for up, down, left, right...

However, I don't think I'm the smartest guy on Earth; of course I have to study what were done by humanity in this area during its centuries-long history... =)) Especially what features Vim (and may be other popular text editors) considers the most important.

This program can be only plugin (may ve for Eclipse).

I just want to make some experiments, but the probability of creation of something useful is not nil (I hope).

Any case your work will be greater than my =)