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This package has been in production usage for several months without issue so marking this a full release. Also, it now has support for a new tamper that can take values from the address bar (via GET) and transform input fields to the GET's value.
For an example see the video on project site but basically you can make contextual Feed importing to different fields (like node references) via import/{feedname}?ref=123 by telling tamper the ref should be used for the import field.