Setting for changing the keymay/keyboard layout for letter code generation

[chefables-mark]

I noticed that the letter codes seemed to follow an asdfg... pattern similar to home row on the QWERTY keyboard, not everyone uses this, inefficient, layout; both dvorak and colemack are popular; and on mac the dvorak-⌘QWERTY is also possible.

This request similar to #33; but in this case a default for each layout (min QWERTY, and dvorak) would be preferred. Full customization is what #33 seems to be about.

In anycase taking the keymap into consideration when choosing the letter combinations would be very useful, as well as trying to make as many combinations as possible alternate hands so a touch typist can hit one key with each hand in most cases. The other obvious consideration would be how far each key is from home-row; i.e. how far does the finger have to travel to type.

You can check out my fork of the extension to see if you like it. (You'll have to run it in test mode).

I'll be thankful for any feedback.

[wenfangdu]

@chefables-mark You can use Jump instead, it supports this feature.