Canon S750 Duplex


When I use the Canon s750 on a windows system, it has a way to allow me to print duplex. It prints the appropriate number of sheets on one side (including a blank page if required), then gives me instructions on how to flip the paper over manually, then finishes the print job on the other side.
Poor man's duplex printing. Worked great.

Can I can get the S750 to do this under MacOSX 10.4.2 on a Powerbook G4? I have the S750 driver installed from Canon (that was painful), but under Print->Layout the "2-sided" option is greyed out. Is there any way to make it work like it did under Windows (which is not something I usually ask for, although even a stopped clock is right twice a day...)