If you can ignore the destruction of the current rendering, you are describing what we do in Regions.http://strolen.com/regions/World_of_Neyathis
Not sure when it exploded, but will fix it probably tomorrow night.
Notwithstanding the horrible look, the suggestion I have is to just write all your posts as normal submissions, just make sure you use a specific freetext when submitting. When you get enough of your world put together, I run a quick script that adds them to a region. Then, as the one linked, all your stuff with that freetext will be in a index type contents on the
right side. When you visit any of those posts, the index remains until you "Leave this Region" then it displays without the index.
If we get some action and suggestions in there again, I will continue to work on it. My slim hope was to make it useable to plan and track adventures somehow. Once you have the submissions, it is all on how it is used and displayed....ideas are almost limitless!