Feature request: add option to show directories first

Hi,
    I think that an option which lets the user to see the usual file listing sorted 
alphabetically, but with directory entries grouped before the files, would be very useful.

I mean; if C is a folder, B and A files; the normal output is:

A
B
C

with a new option like this one I'm proposing:

C
A
B

Do you agree ?

Francesco Montorsi