What are the most common commands used in a text editor? You know how Dvorak put the most common keys on the home row, and the least common in the hard to reach places? We should apply that same principle to create the whitest of the white layouts. None of that silly "b" for backwards one character "f" for forward one character.
What we should do is order the commands just like this letter frequency chart, and then use that as a guide as to where these commands should go on the keyboard. The keys should retain a bit of a grouping together where it makes sense, like how the vowels are all together on the Dvorak layout on the left hand side of the home row even though a consonant may appear more often than one of those vowels.