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ok, so you need to add this Item.

Item[KeyEvent["t", Modifiers -> {Control}],
  FrontEndExecute[
      FrontEnd`NotebookApply[FrontEnd`InputNotebook[], 
                             RowBox[{"foo", "[", "\[SelectionPlaceholder]", "]"}]];
      FrontEnd`SelectionMove[FrontEnd`InputNotebook[], All, Expression, 2];
      FrontEnd`SelectionEvaluate[FrontEnd`InputNotebook[]]
                 ]
    ]

###Usage

Select what you need

Use Ctrl+t

###Ref:

Here is a tutorial how to add a new shortcut: Automating Esc [[ Esc formatting?