"Parallel Kernel Status" is set in the following line of MenuSetup.tr
MenuItem["Parallel &Kernel Status...", KernelExecute[Parallel`Palette`menuStatus[]], MenuEvaluator -> Automatic],
On should not change these files, however you could change that line to
MenuItem["Parallel &Kernel Status...", KernelExecute[Parallel`Palette`menuStatus[]], MenuEvaluator -> Automatic, MenuKey["F5", Modifiers->{"Control"}]],
in order to get Ctrl+F5 as the shortcut to open the "Parallel Kernel Status" palette.
You could also use MenuKey["5", Modifiers->{"Control"}]
, but then you should also change MenuItem["&Opposite Position", "Otherscript", MenuKey["5", Modifiers->{"Control"}]]
in MenuSetup.tr and
Item[KeyEvent["5", Modifiers -> {Control}, CellClass -> BoxFormData], "Otherscript"]
in KeyEventTranslations.tr to something else.