As far as I'm concerned, No. And I'll explain very briefly.
Usually the staff checks the proof before verifying a ban. Therefore, This is an "Innocent until proven guilty" type of an environment, and since this is a game, and with reliable proof like screenshots, and in-game clips known as "Replays" there is no need for a "Ban Appeal" forum.
I do like the thought however, but adding a forum like this, would provide a way for hackers to try and "convince" the people that they didn't hack or do whatever that was done.
Also, I remember someone pointing out about 2 people swapping, and if this was true, ProStyle wouldn't be at lvl 80 right now.