I used Cameron Kaiser's suggestion (cpin) and after a few tries managed to figure out the proper syntax.  :)  As long as there is enough space on the MacOS part for the file, you can launch the Installer, run the Mini-Shell, and enter "cpin :someFileAtMacRootLevel /someFileAtBSDRootLevel".  (Colon is analogous to a slash in HFS.)  I couldn't find any documentation on cpin/cpout, but I didn't spend a lot of time looking either.

This might make a good FAQ:  How can I transfer files without a network and no floppy support?

Now I just need to look up how to use pkg_add and I'll be set.  :)

Tim

-- 
Tim Larson          <><   <><   <><   <><   <><
Info. Services - Internal Medicine Clinical Systems, Mayo Clinic, Rochester
Protective of your Constitutional freedoms?  Kovatchevich for US Senate.
He is no fool who gives up what he cannot keep to gain what he cannot lose. - Jim Elliot