Add fn/ctrl/cmd + left click -> right click: https://genesy.github.io/karabiner-complex-rules-generator/#eyJ0aXRsZSI6IkFkZCBjdHJsL2ZuICsgbGVmdCBjbGljayAtPiByaWdodCBjbGljayIsInJ1bGVzIjpbeyJkZXNjcmlwdGlvbiI6ImN0cmwrbGVmdCBjbGljayB0byByaWdodCBjbGljayIsIm1hbmlwdWxhdG9ycyI6W3sidHlwZSI6ImJhc2ljIiwiZnJvbSI6eyJwb2ludGluZ19idXR0b24iOiJidXR0b24xIiwibW9kaW…

ctrl-fn-left-click-right-click.json

{
  "title": "Add ctrl/fn/cmd + left click -> right click",
  "rules": [
    {
      "description": "ctrl+left click to right click",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "pointing_button": "button1",
            "modifiers": {
              "mandatory": [
                "left_control"
              ]
            }
          },
          "to": [
            {
              "pointing_button": "button2",
              "repeat": false
            }
          ]
        }
      ]
    },
    {
      "description": "fn+left click to right click",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "modifiers": {
              "mandatory": [
                "fn"
              ]
            },
            "pointing_button": "button1"
          },
          "to": [
            {
              "repeat": false,
              "pointing_button": "button2"
            }
          ]
        }
      ]
    },
    {
      "description": "cmd+left click to right click",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "modifiers": {
              "mandatory": [
                "left_gui"
              ]
            },
            "pointing_button": "button1"
          },
          "to": [
            {
              "repeat": false,
              "pointing_button": "button2"
            }
          ]
        }
      ]
    }
  ]
}