Flat extract option

Hi Denis,
 
I'm working a little bit on gdar again and I want to add the flat extract option "-f|--flat" of dar.
I found the corresponding libdar api archive_options_extract.set_flat and I have a first draft.

My question is a little bit more in general about the flat extract option.
As far as I understand, the option is meant to extract all files, regardless of the folder structure.
Thats useful if I want to restore some files in a different directory, without the whole tree.
I was also thinking about the use-case, to extract a whole folder at a different location (without the upper tree structure).
For example, we have the following folder structure:
/
/foo
/foo/bar
/foo/bar/file1.txt
/foo/bar/file2.txt

And I want to extract the folder bar/ independently of its parent foo.

Is this possible with dar?
If not, do you think this would be worth thinking about?

Best regards,
Tobias