For our project, we want to open our electron app from tray with a keypress on "Scroll Lock" (js keycode 145) but this is no registered accelerator that we can use.
atom/common/keyboard_util.cc
if (str.size() == 1)
    return KeyboardCodeFromCharCode(str[0], shifted);
  else
    return KeyboardCodeFromKeyIdentifier(str, shifted);
}
int WebEventModifiersToEventFlags(int modifiers) {