Hom......Good Post.....I guess some missed the point of your post. I don't know if there are any really unique features anymore. Many of the features mentioned are things that we realize we would like in our next RV.
In the list above, "katoomer" has probably the most unique feature with the custom sound system he installed. You just don't find something that nice in most coaches and it sounds like he really crafted a nice system.
My new coach had a rod, like a car uses to support the front hood. I thought that was a little cheesy for the level of my coach. I made some custom mounts and put pistons on the hood. It works really nice and just needs a finger to open it. It's unique because Newmar doesn't sell it, but it's not that special.