I think it would be helpful to everybody at this point to categorize items by which software they work with. The rift between DAZ and Poser is only going to get worse. I realize that some items do work in both. Frankly I don't want to spend time looking at items that don't have DAZ support. You might need to split the Poser side between "Non-DSON" and "DSON". Having what shaders work with would help for both, Poser is soon going to use two rendering engines also from what I have been reading. Lights are an issue too. I would suggest you implement it on new items only, trying to rate the back catalog would be a bear of a project, so probably the New Items category would be the place to start.

I want to add that this problem is greater now because the site is so slow to navigate to start with, it isn't just the Poser/DAZ rift that is a problem.