The whole forum is still under construction, and is far from finished. I'm sure the admins already know alot of these features,
but they might just be too busy with other things to just implement the "fun" stuff.
Currently, we're working on re-designing the forums, as it is quite bland at the moment.
Another reason that might add on the the lack of other features, is that the forum currently has no need for them.
The Fansite main page(s) are also still under construction.
Adding the "Arcade" would be a bit of a space waster. As in, not everyone would use it.
(Having many things doesn't always equal better.)
It's a good idea, and it's nice that IPB offers so many different options,
but i myself can't see these things take high priority at the moment.
+1 for a good suggestion though. :3
Oh and welcome to the forums~!