Personally I'd really love to see this area included as a little "bonus", like the Rime Age was with RealMyst. You could even visually incorporate the narrative that Richard A. Watson came up with for the area - that it was part of the original system of wooden bridges that linked the islands before they began to drift apart.
Also, it would add a nice little garden area to the rather desolate Survey Island, akin to the oasis in the Selenetic Age
. Based on that image, it appears it'd be accessible via the underground tunnels.