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Its a friend of mine who asked the question because his mk3 and 580ex2 still fires the flash when set to disabled.
whats the other function of which you speak? As the 5d series have no focus assist beam on camera you have to have the flash powered up.
afaik the situation the guy was in was low light event work where he has a skyport connected via the pc terminal to trigger his quadras, but he also needs the assist beam to help focus in low light.
In the AF menu.. there's the option to enable/disable af assist even without a speedlite attached.