Auto login boot camp partition in VMWare Fusion?
As the auto-login or password is in Windows, and Windows doesn't know if it is booted via BootCamp or VMWare, I don't think you can do this from the Windows side.

It doesn't seem likely, but perhaps you can set it to always require password, but then use AppleScript and VMWare, or Automator GUI Scripting, to enter the password for you.