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 'v':
      return ui::VKEY_V;
    case 'w':
      return ui::VKEY_W;
    case 'x':
      return ui::VKEY_X;
    case 'y':
      return ui::VKEY_Y;
    case 'z':
      return ui::VKEY_Z;
    case ')':
      *shifted = true;
      FALLTHROUGH;
    case '0':
      return ui::VKEY_0;
    case '!':
      *shifted = true;
      FALLTHROUGH;
    case '1':
      return ui::VKEY_1;
    case '@':
      *shifted = true;
      FALLTHROUGH;
    case '2':
      return ui::VKEY_2;
    case '#':
      *shifted = true;
      FALLTHROUGH;
    case '3':
      return ui::VKEY_3;