Karabiner Complex Modification Rules - OSX + Filco/Durgod/Akko/LeoPold

karabiner.json

{
  "global": {
    "check_for_updates_on_startup": true,
    "show_in_menu_bar": true,
    "show_profile_name_in_menu_bar": false
  },
  "profiles": [
    {
      "complex_modifications": {
        "parameters": {
          "basic.simultaneous_threshold_milliseconds": 50,
          "basic.to_delayed_action_delay_milliseconds": 500,
          "basic.to_if_alone_timeout_milliseconds": 1000,
          "basic.to_if_held_down_threshold_milliseconds": 500,
          "mouse_motion_to_scroll.speed": 100
        },
        "rules": [
          {
            "description": "print_screen to command+shift+3",
            "manipulators": [
              {
                "from": {
                  "key_code": "print_screen"
                },
                "to": [
                  {
                    "key_code": "3",
                    "modifiers": ["left_command", "left_shift"]
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "shift+print_screen to command+control+shift+4",
            "manipulators": [
              {
                "from": {
                  "key_code": "print_screen",
                  "modifiers": {
                    "optional": ["left_shift", "right_shift"]
                  }
                },
                "to": [
                  {
                    "key_code": "4",
                    "modifiers": ["left_control", "left_command", "left_shift"]
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "command+print_screen to command+shift+4",
            "manipulators": [
              {
                "from": {
                  "key_code": "print_screen",
                  "modifiers": {
                    "optional": ["left_shift", "right_shift"]
                  }
                },
                "to": [
                  {
                    "key_code": "4",
                    "modifiers": ["left_command", "left_shift"]
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "pause to command+control+q",
            "manipulators": [
              {
                "from": {
                  "key_code": "pause"
                },
                "to": [
                  {
                    "key_code": "q",
                    "modifiers": ["left_command", "left_control"]
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "scroll_lock to control+space",
            "manipulators": [
              {
                "from": {
                  "key_code": "scroll_lock"
                },
                "to": [
                  {
                    "key_code": "spacebar",
                    "modifiers": ["left_control"]
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "shift+enter to command+enter / custom Slack send messages",
            "manipulators": [
              {
                "conditions": [
                  {
                    "bundle_identifiers": ["^com\\.tinyspeck\\.slackmacgap$"],
                    "type": "frontmost_application_if"
                  }
                ],
                "from": {
                  "key_code": "return_or_enter",
                  "modifiers": {
                    "mandatory": ["shift"]
                  }
                },
                "to": [
                  {
                    "key_code": "return_or_enter",
                    "modifiers": ["right_command"]
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Mouse forward button to forward in Finder",
            "manipulators": [
              {
                "conditions": [
                  {
                    "bundle_identifiers": ["^com\\.apple\\.finder"],
                    "type": "frontmost_application_if"
                  }
                ],
                "from": {
                  "pointing_button": "button5"
                },
                "to": [
                  {
                    "key_code": "close_bracket",
                    "modifiers": ["command"]
                  }
                ],
                "type": "basic"
              }
            ]
          },
          {
            "description": "Mouse backward button to backward in Finder",
            "manipulators": [
              {
                "conditions": [
                  {
                    "bundle_identifiers": ["^com\\.apple\\.finder"],
                    "type": "frontmost_application_if"
                  }
                ],
                "from": {
                  "pointing_button": "button4"
                },
                "to": [
                  {
                    "key_code": "open_bracket",
                    "modifiers": ["command"]
                  }
                ],
                "type": "basic"
              }
            ]
          }
        ]
      },
      "devices": [
        {
          "disable_built_in_keyboard_if_exists": false,
          "fn_function_keys": [],
          "identifiers": {
            "is_keyboard": true,
            "is_pointing_device": false,
            "product_id": 130,
            "vendor_id": 12136
          },
          "ignore": false,
          "manipulate_caps_lock_led": true,
          "simple_modifications": [
            {
              "from": {
                "key_code": "application"
              },
              "to": [
                {
                  "key_code": "right_command"
                }
              ]
            },
            {
              "from": {
                "key_code": "left_command"
              },
              "to": [
                {
                  "key_code": "left_option"
                }
              ]
            },
            {
              "from": {
                "key_code": "left_option"
              },
              "to": [
                {
                  "key_code": "left_command"
                }
              ]
            }
          ]
        },
        {
          "disable_built_in_keyboard_if_exists": false,
          "fn_function_keys": [],
          "identifiers": {
            "is_keyboard": false,
            "is_pointing_device": true,
            "product_id": 45093,
            "vendor_id": 1133
          },
          "ignore": false,
          "manipulate_caps_lock_led": false,
          "simple_modifications": []
        }
      ],
      "fn_function_keys": [
        {
          "from": {
            "key_code": "f1"
          },
          "to": [
            {
              "consumer_key_code": "display_brightness_decrement"
            }
          ]
        },
        {
          "from": {
            "key_code": "f2"
          },
          "to": [
            {
              "consumer_key_code": "display_brightness_increment"
            }
          ]
        },
        {
          "from": {
            "key_code": "f3"
          },
          "to": [
            {
              "apple_vendor_keyboard_key_code": "mission_control"
            }
          ]
        },
        {
          "from": {
            "key_code": "f4"
          },
          "to": [
            {
              "apple_vendor_keyboard_key_code": "launchpad"
            }
          ]
        },
        {
          "from": {
            "key_code": "f5"
          },
          "to": [
            {
              "apple_vendor_top_case_key_code": "illumination_down"
            }
          ]
        },
        {
          "from": {
            "key_code": "f6"
          },
          "to": [
            {
              "apple_vendor_top_case_key_code": "illumination_up"
            }
          ]
        },
        {
          "from": {
            "key_code": "f7"
          },
          "to": [
            {
              "consumer_key_code": "rewind"
            }
          ]
        },
        {
          "from": {
            "key_code": "f8"
          },
          "to": [
            {
              "consumer_key_code": "play_or_pause"
            }
          ]
        },
        {
          "from": {
            "key_code": "f9"
          },
          "to": [
            {
              "consumer_key_code": "fast_forward"
            }
          ]
        },
        {
          "from": {
            "key_code": "f10"
          },
          "to": [
            {
              "consumer_key_code": "mute"
            }
          ]
        },
        {
          "from": {
            "key_code": "f11"
          },
          "to": [
            {
              "consumer_key_code": "volume_decrement"
            }
          ]
        },
        {
          "from": {
            "key_code": "f12"
          },
          "to": [
            {
              "consumer_key_code": "volume_increment"
            }
          ]
        }
      ],
      "name": "Default profile",
      "parameters": {
        "delay_milliseconds_before_open_device": 1000
      },
      "selected": true,
      "simple_modifications": [],
      "virtual_hid_keyboard": {
        "country_code": 0,
        "indicate_sticky_modifier_keys_state": true,
        "mouse_key_xy_scale": 100
      }
    }
  ]
}

shell.sh

# How to get Bundle ID of Mac application?
$ osascript -e 'id of app "/Applications/Slack.app"'
$ osascript -e 'id of app "/System/Library/CoreServices/Finder.app"'

# Or go to https://offcornerdev.com/bundleid.html

This actually helped a lot my man.

Hope all is well!

Ultimately what worked for me was

/Users/USERNAME/.config/karabiner/karabiner.json <—edit this to customize

This was after importing a file from their website which was similar to what I needed but not exactly. Thanks to everyone who posted in this thread.

you can use vim ~/.config/karabiner/karabiner.json to edit this file