Updates for un(der)documented and new features

I haven't gone through everything yet, but I hit the points I knew were missing. Are there any suggestions for areas that could be expanded or anything else that's missing?

I find navigation here to be a little challenging if you don't know exactly what you're looking for. Would it be ok to re-arrange and re-index the docs? It looks like it was originally designed to be read-through from the beginning, which I think is an excellent format for this sort of thing, but over time it has gotten a little jumbled.