Press and hold CTRL while booting. Works the same as CTRL+D on AmigaOS3.x
Pressing LEFT+RIGHT mouse buttons or Pressing NumLock if for Kickstart boot screen, so its one extra step to boot with out startup-sequence.
Yes it does work, you just need to hammer the keyboard, or press the key at the right time, boot process is quick so its not easy. defiantly some thing for the IT pro :-)