If I were an employee of EF, I'd fix this problem in a heartbeat. It should be possible to attach additional information to props, figures, lights, and materials (for a number of reasons, many having nothing to do with attribution.) So whoever made the thing could put their little contact info and product name if applicable right in the product. This would be automatically loaded by Poser when you load the item into a scene.

Now you are in a Poser scene - you ask Poser to tell all about the stuff used in the scene. Presto - it makes a nice little paragraph about it in a well known (probably XML) format or in human readable format. Last step - somebody at Renderosity puts a box into the gallery submit form for that info - autoparse - done.

It is really incredible to me that Word documents, JPEG images, etc - all very old formats - have meta-data (data about the data) that can carry all sorts of useful information, but these CG objects do not. I should think in a community  that is constantly wanting to use and give credit for other's work, that it would be built in. As a software developer, I can assure you this is a trivial engineering task. It is not even remotely comparable in difficulty to the job of parsing and rendering all these items.

I also want to attach more meta-data to mesh vertices than just UV coordinates, which data would be very useful in designing sophisticated shaders.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)