just checked it on a DP 8.1 installation. i go onder restore -> Filesystem -> expand the server, expand the drive. then if i expand a folder, it only expands one level not the whole subtree.
You can do a restore by query. under restore, at the left bottom you have "Tasks", open this. then you have "Restore by Query". I dont use it often because with all previous version it took ages until you found the data... dont know how fast it is now since dp 8.x introduced the new postgre sql IDB instead of RAIMA DB in the previous Versions.