Answer by Mark for Visual Studio Code - Indent single line with tabulator-key

You could use this default keybinding:

{
  "key": "ctrl+]",
  "command": "editor.action.indentLines",
  "when": "editorTextFocus && !editorReadonly"
}

to tab single or multilines. If you want that bound to tab you could modify it to:

{
  "key": "tab",
  "command": "editor.action.indentLines",
  "when": "editorHasSelection && editorTextFocus && !editorReadonly"
}

I added the editorHasSelection clause so it operates only when something is selected on your line, but then you would lose the normal simple tab behavior (that you don't like).