Make comments of VSCode start at column position 0

Here is a later and better way to do it: https://stackoverflow.com/a/72311327/836330

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It is a little tricky, but test this out. You need a macro extension like multi-command.

In your keybindings.json:

 {                   // disable ctrl+/ for js/php files only
   "key": "ctrl+/",
   "command": "-editor.action.commentLine",
   "when": "editorTextFocus && !editorReadonly && resourceExtname =~ /\\.(js$|php)/"
 },

{                   // call the macro multiCommand.insertCommentColumn0 when
                     // commenting a single line
  "key": "ctrl+/",
  "command": "extension.multiCommand.execute",
  "args": { "command": "multiCommand.insertCommentColumn0" },
  "when": "!editorHasSelection && editorTextFocus && !editorReadonly && resourceExtname =~ /\\.(js$|php)/" 
},      

{                    // call the macro multiCommand.AddCommentColumn0MultipleLines when
                     // commenting more than one line
  "key": "ctrl+/",
  "command": "extension.multiCommand.execute",
  "args": { "command": "multiCommand.AddCommentColumn0MultipleLines" },
  "when": "editorHasSelection && editorTextFocus && !editorReadonly && resourceExtname =~ /\\.(js$|php)/" 
},

 {                   // call the command editor.action.removeCommentLine when
                     // commenting a single or multiple line(s)
   "key": "ctrl+shift+/",
   "command": "editor.action.removeCommentLine",
   "when": "!editorHasSelection && editorTextFocus && !editorReadonly && resourceExtname =~ /\\.(js$|php)/"
 },

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In your settings.json, the macros:

"multiCommand.commands": [

  {
    "command": "multiCommand.insertCommentColumn0",
    "sequence": [
      "cursorLineStart",
      {
        "command": "type",
        "args": {
          "text": "// "
        }
      },
    ]
  },
  {
    "command": "multiCommand.AddCommentColumn0MultipleLines",
    "sequence": [
      "editor.action.insertCursorAtEndOfEachLineSelected",        
      "cursorLineStart",
      {
        "command": "type",
        "args": {
          "text": "// "
        }
      },
      "removeSecondaryCursors"
    ]
  },

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This resourceExtname =~ /\\.(js$|php)/ restricts the keybindings to .js and .php files (and not .json files). You can change that if you want the keybindings to apply to more file types.

Ctrl+/ to apply the comment characters at column position 0 and Ctrl+Shift+Ctrl to remove the comment characters.

You can change those keys to whatever you want. Note it isn’t (and currently cannot be) a simple toggle using Ctrl+/ – with a keybinding there is no way to detect whether a comment already exists. You would need an extension to get that kind of functionality.

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One downside of this method is that if you select multiple lines and comment them, you will lose that mult-line selection (as can be seen in the demo).