Currently the XCode Plug-in always overwrites the technical and marketing versions in the Info.plist file of the project being built (CFBundleVersion and CFBundleShortVersionString). The default behavior should be to leave those versions alone, or at least provide some option NOT to muck with these values.

Common Use Case: Info.plist versions may be automatically set when checked out of SVN/GIT/CVS, or may be set automatically by a script build phase. In these cases having the Xcode plugin overwrite the generated values is a non-feature.