I didn't read any above posts because I have problems reading big walls of text, but I believe that if you are using it in the right context, it's fine. I don't think it's needed, it's easy to find other words that aren't slurs to replace it, but I don't think it would be a problem as long as you aren't using it to insult anyone.

Rethought it, the word really isn't needed, there are plenty of other words that aren't slurs and aren't prone to be used out of context that you could easily use instead of the word "nigga". I know some use it to greet others, but even of a few people get offended by it, it's really not worth having it allowed, because you could use other things you could say to avoid it. I voted yes on the poll, I'd change it if I could.