FrontEndExecute[
 FrontEnd`AddMenuCommands["DuplicatePreviousOutput", {Delimiter,
   MenuItem["pagebreak", FrontEnd`KernelExecute[
     {
                          SelectionMove[InputNotebook[], After, Cell], 
      NotebookWrite[ InputNotebook[], 
       Cell["", "PageBreak", PageBreakBelow -> True], After]}], 
    MenuKey["u", Modifiers -> {"Control"}], 
    System`MenuEvaluator -> Automatic]}]]