I think that what it did before is:

CMessageBuffer mb; mb.append((int)MDFS_ITERATE_FILES).append(wildname).append(recursive).append("").append(includesuper); // "" is legacy
 if (user)
        user->serialize(mb);
queryCoven().sendRecv(mb,RANK_RANDOM,MPTAG_DFS_REQUEST);

Is it possible to enhance it to include more filters: owner, cluster name, wild description, file size (low/high), modified time (low/high), superfileOnly, not in superfile?