The new methods are:

keep the roll over state of the parent button:
setKeepRolloverStatus(true)
Hide the children again, regardless of their button state. Either after a time specified by setFadeOutTimerDelay(3) or if the user clicks anywhere off the navigation:
setAlwaysHideChildren(true)

And the undocumented methods are used for depth handling:

Sets the submenu that is fading in behind the parent button. In the SWF below I have used a shadow on the parent button to demonstrate it
setFadeInDepth(“back”)

You can even set the depth of each button state (rollOver, rollOut, Press, release):
setBtnDepths(“back”,”front”,”front”,”front”)

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Explore and compare these two SWFs. At first glance they look the same. But there is a difference.

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Settings in the SWF above:

navigationManager.setKeepRolloverStatus(false);
navigationManager.setAlwaysHideChildren(false);
navigationManager.setBtnDepths(“front“,”back“,”back“,”front”)
navigationManager.setFadeInDepth(“front“);

Download source,  demo files and documentation

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Cheers!