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
case '$':
      *shifted = true;
      FALLTHROUGH;
    case '4':
      return ui::VKEY_4;
    case '%':
      *shifted = true;
      FALLTHROUGH;
    case '5':
      return ui::VKEY_5;
    case '^':
      *shifted = true;
      FALLTHROUGH;
    case '6':
      return ui::VKEY_6;
    case '&':
      *shifted = true;
      FALLTHROUGH;
    case '7':
      return ui::VKEY_7;
    case '*':
      *shifted = true;
      FALLTHROUGH;
    case '8':
      return ui::VKEY_8;
    case '(':
      *shifted = true;
      FALLTHROUGH;
    case '9':
      return ui::VKEY_9;