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 ';':
      return ui::VKEY_OEM_1;
    case '+':
      *shifted = true;
      FALLTHROUGH;
    case '=':
      return ui::VKEY_OEM_PLUS;
    case '<':
      *shifted = true;
      FALLTHROUGH;
    case ',':
      return ui::VKEY_OEM_COMMA;
    case '_':
      *shifted = true;
      FALLTHROUGH;
    case '-':
      return ui::VKEY_OEM_MINUS;
    case '>':
      *shifted = true;
      FALLTHROUGH;
    case '.':
      return ui::VKEY_OEM_PERIOD;
    case '?':
      *shifted = true;
      FALLTHROUGH;
    case '/':
      return ui::VKEY_OEM_2;