When I'm looking a a very long preview listing of a very deep or wide tree, I like to simplify things by collapsing the listing of any folders I know I don't need to examine. I was just doing this where I had a folder with thirty or so subfolders, and I had to collapse each one individually.
I would have loved to just collapse the parent folder!
How about adding "expand" and "collapse" to the "recursive" menu?