Key chords is the bane of keyboarding.

There are 3 types of keyboard shortcuts to invoke commands in software:

• ① Single key ➢ for example: 【F1】, 【⇞ Page △】.
• ② Key chord ➢ for example: 【Ctrl+c】, 【Ctrl+⇧ Shift+z】, 【Alt+F4】.
• ③ Key sequence of single keys or chords. ➢ for example: on Microsoft Windows, 【F10 e c】 for copy, or 【Alt+Space c】 to close window.

of these, in terms of efficiency and hand health (Repetitive Strain Injury), the single key is the best. Key sequence of single keys is second best. Key chord is the worst.

Key chord is the most hard on hand health, but is also conceptually the most convoluted.

i remember in around 1991, when i first learned about key chord on the Macintosh Classic. I remember thinking, it's strange. You have to hold ⌘ Cmd first, then press the key c, then, release c, then, release ⌘ Cmd. It must be in that specific order.

A more natural way is either key sequence, or real chords. Real chords, meaning, pressing several keys together but you don't have to worry about which to hold or release first. Stenograph machines are like that.

I've got it. There is a utility called xbkeys for setting accessibiltiy options for xorg.

From xbkey manual:

To switch sticky keys on or off, and optionally set or reset:
() two keys pressed at the same time stops sticky keys;
() a modifier pressed twice will be locked:

    [-]{sticky|st} [[-]twokey|[-]latchlock]...

I ran this:

$ xkbset sticky -twokey -latchlock

That command can go in .xinitrc

# turn on stickykeys. don't let two keys pressed at the same time disable it.
# don't turn on "latch lock", ie pressing a modifier key twice "locks" it on.
xkbset accessx sticky -twokey -latchlock

# don't expire these settings. (run xkbset q exp for details.)
xkbset exp 1 =accessx =sticky =twokey =latchlock

Inadapté à la dactylographie et à l’écriture du français, le célèbre clavier azerty a les touches qui sifflent. Des passionnés proposent depuis des années d’autres solutions.

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Don't make sense on non qwerty keyboards.

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