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]}]]