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You should be able to rainstorm a lot more than that.
Try Overture and the Google AdWords keyword tool. In fact search for 'keyword tool' and I'm sure the results will be filled with sites.
You've got 8 categories on the forum starting with Arcade, so we're already up to 8 keyphrases built around the single word arcade. I went into the arcade content forum and saw links for game talk and video talk. I'd suggest that just about every keyphrase you find with the word arcade you could replace arcade with either video or game or even both.
In truth I would think a forum is going to build it's own content and the content is what will end up determining the keywords. You can control it somewhat with the words you use to set up the forum categories and even by starting your own posts, but the majority of the content will be created by people not thinking about keywords at all.
Just encourage the forum to grow and get links pointing to it.
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