mod_authz_svn single tree access

Hi
   I'm wondering if there has been any discussion about adding the ability to allow traversal of a single tree path.
Currently one has to provide read access to to each level of the tree and prune off every other directory in the path.
I'd like to give a user access to root/path1/path11/path111/*
But I don't want them to have any access to or visibility of other directories / files along the way.
eg root/path1/path2 would not be visible or accessible.

Probably needs another access type?  'x' to allow traversal to a deeper level, but hide everything else?

The prune method is not reliable as new folders may be added, sometimes theres a lot of folders etc there are files in the folders along the desired path.

Cheers
    Richard Tresidder