Caps Lock acts as another modifier, appending tmux prefix key (Ctrl+b) to some keys. For use with karabiner

capslock_mods.json

{
  "title": "Caps Lock Modifications",
  "rules": [
    {
      "description": "Caps Lock Modifications",
      "manipulators": [
        {
          "from": {
            "key_code": "caps_lock",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "set_variable": {
                "name": "caps_lock pressed",
                "value": 1
              }
            }
          ],
          "to_after_key_up": [
            {
              "set_variable": {
                "name": "caps_lock pressed",
                "value": 0
              }
            }
          ],
          "to_if_alone": [
            {
              "key_code": "out"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "d",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "f1"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "f",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "f2"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "open_bracket",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "open_bracket"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "return_or_enter",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "w"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "c",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "c"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "s",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "s"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "m",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "m"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "semicolon",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "semicolon",
              "modifiers": ["left_shift"]
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "spacebar",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "spacebar"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "z",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "z"
            }
          ],
          "type": "basic"
        },
        {
          "conditions": [
            {
              "name": "caps_lock pressed",
              "type": "variable_if",
              "value": 1
            }
          ],
          "from": {
            "key_code": "o",
            "modifiers": {
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "b",
              "modifiers": ["left_control"]
            },
            {
              "key_code": "o"
            }
          ],
          "type": "basic"
        }
      ]
    }
  ]
}