This question has been answered by donshakespeare. See the first response.
The pagetitle is repeated quite often due to Editors have to input their names as pagetitle.Editors often use their names as pagetitle, and this habit causes duplicate names in the resource tree which is hard to sort out?
So as a Admin it is pretty annoying to identify unique resources to delete. (Editors see them quite well themselves over NP-Update listing).
Specify the Resource field to use when rendering the nodes in the Resource Tree. Defaults to pagetitle, although any Resource field can be used, such as menutitle, alias, longtitle, etc.