It isn't working because you haven't configured your forums correctly. First you need to create a category and then a forum, after that you need to connect that forum to that category in order for it to work. Forums without category and categories without forums, won't show up.
There is no ETA when it will be released.
That's not gonna be added to Nameless, considering there are 3rd party options like Dynmap that you can easily embed into Nameless.
I don't think that will be added, but if it would, definitely not any time soon. So if you need that, your best bet is to hire a developer to make you a module for that.
Hello, you can add/remove lables from a forum post by editing it. But if you want to have staff applications, I would recommend using Forms module, since it is a lot better and has a lot more feature specifically for applications like that. You can find it here.