Comment by eviks

> I analysed a full day of my keystrokes with xkbcat, which was very useful: my most frequently pressed keys are not what I would have guessed! For example, I discovered that I type ‘>’ far more often than ‘<’6.

Excellent approach, though rarely used in layout design, at most you'd get frequency distribution of typed text instead of pressed keys

> Both hands need access to each of these modifiers, because using a modifier and typing a key with the same hand often involves painful contortions.

While home row mods is a better solution, another alternative is "sticky" mods that would remove the need to hold, so you can use the same hand without pain

> On a normal keyboard, if I press ‘f’ then ‘g’ I can roll from one to the other and press ‘g’ while ‘f’ still hasn’t been released – ‘fg’ will be sent to the computer. With home row mods, this ends up sending ‘G’.

This might be config issue. With a roll you release F before G (your fingers roll off the first key before rolling off the second), so this should type regular FG in properly configured home row mods instead of just capitalized G.

> The practical effect of this is that ‘f’ isn’t sent to the computer as soon as you press down, but only when you release the key.

Are there implementations that send F immediately, but send backspace to delete F if you hold?