The color node or the simple color (firefly) could be used in place of the RGB node. My limited understanding is that the Attribute node is based on different functions of blender like the quick effects (smoke) and the node is tied to those. Or it's used as a way for more advanced users to create their own node function. Unless we get those options, the node is useless in poser anyhow. I believe the output node would be the equivalent of Poser's root nodes.

I think your list of nodes might be a little old. I don't see the procedural node listed in the current version of blender, and looking through the nodes, I saw a few others I don't remember in Poser, but I didn't double-check so I may have missed them. But I realize that blender is changing and adding frequently and it takes time to adapt the nodes to poser and test them to make sure they work as they should and don't cause the computer to explode. We may see some of the newer nodes eventually. I too hope for a color ramp and the RGB curves nodes. I know that you can use the FF color ramp sometimes and I have, but there are aspects of the cycles one that that old one doesn't have

---

Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10