So this pops up in the review queue:
It's a well-formed, well-considered question (esp. once OP responded to my request for clarification). It could be closed based on the lack of access to the third-party module. That said, the underlying question ("how to add additional attribute values to layered nav") is generally answerable without access.
Recently I'm seeing a lot of old, unanswered questions in the close queue. I get that we are trying to improve the answer rate of the site, and I get that we are fighting against a flood of bad questions, but I wonder if we are going a bit far. Thoughts?