Manual Duplex Printing with a Brother Multifunction Printer

I am thinking of buying a Brother MFC 210c, 420c or 640c multifunction
printer. I now have a Brother HL 1440 Laser Printer and its driver has a
manual duplex option which makes two sided printing a breeze. I have not
been able to find out from the Brother on-line documentation whether the
drivers for those printers offer the same type of manual duplex printing.
Brother has not responded to my email question on the subject.

Can anyone here tell me if the feature is offered by the drivers for any of
the printers?

Thank you.