I have just produced a quick turn around visual for client - I did not have enough time for any post render workflow so therefore used new background wizard. Please find below an illustration of method used for tweaking image. I would have uploaded to post\thread but still having problems with ning - Hopefully these stages will be circumvented if you can advance the wizard.
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Make sure you download the latest release from: Downloads.
http://www.renderplus.com/php/download_links.php
The background Wizard was not in the first release of 4.0, but is in the current download.
It is only available after rendering the model.