defaults write NSGlobalDomain NSModifierFlagMapping "{LeftControl=Command;RightControl=Control;LeftAlt=Alt;RightAlt=Alt}"
This allows you to use the the right control key (or any key you set to "Control") to control-drag files in Project Builder on Windows NT. You can also set this mapping in the Project Builder domain if you only want it to apply to Project Builder. Using NSGlobalDomain will apply it to all of the current user's applications.
For more information on customizing WebObjects' text system, see the TextDefaultsAndBindings documentation in the Programming Topics section of WOInfoCenter.