you're going to have to give me a for example, of why and where this sort of thing would be useful.

and if there is only to be a certain number of assets per level displayed, how do we determine that? is it the N newest, or the N first in rank, etc? 

In my particular case, I'm looking to use it as a way to list the latest news articles stored in a folder. I'd like to have only the last x articles listed, and this seems to be the only way I could devise for limiting the Navigation control to produce the desired output.

As to which items to display, my preference would be newest by date.