Hi,
Agreed, the docs for OSPF on the PIX are rather hidden. Hopefully we can make them more prominent in future releases. Take a look here and see if this is not what you are looking for:
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_63/config/bafwcfg.htm#1129432
The OSPF code on the PIX was ported over (with a few minor changes) from IOS so pretty much anything you can do in IOS with OSPF should also work in PIX. Please make sure you also have the latest 6.3 release (6.3(3)) as there have been several bugs resolved since 6.3(1). Good luck and let us know if you have specific questions.
Scott