Karabiner-Elements設定（~/.config/karabiner/assets/complex_modifications/ に置く）

fjyuu.json

{
  "title": "Personal rules (@fjyuu)",
  "rules": [
    {
      "description": "Change spacebar to left_shift. (Post spacebar if pressed alone)",
      "manipulators": [
        {
          "from": {
            "key_code": "spacebar",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "key_code": "left_shift"
            }
          ],
          "to_if_alone": [
            {
              "key_code": "spacebar"
            }
          ],
          "type": "basic"
        }
      ]
    },
    {
      "description": "Change quote to right_option. (Post quote if pressed alone)",
      "manipulators": [
        {
          "from": {
            "key_code": "quote",
            "modifiers": {
              "optional": [
                "any"
              ]
            }
          },
          "to": [
            {
              "key_code": "right_option"
            }
          ],
          "to_if_alone": [
            {
              "key_code": "quote"
            }
          ],
          "type": "basic"
        }
      ]
    }
  ]
}