That's close, and actually a pretty cool plugin. But I'd like the list attribute with the color swatch to be part of the SketchUp Materials Window that pops up. That way I can select from the list the correct material by name while I'm adding color to parts of the model. The Material Maintenance window that pops up does not let you pick a color to add directly to the model, it's for consolidating and replacing colors, which will be useful too.
My need for this is partially due to the fact that I don't see certain colors well, so some look really similar to me. With the addition of the name to the color, it helps ensure that I'm picking the right "green" or "yellow" (or whatever material I need). I hope that explains it better?