I don’t agree with adding avatars either, it was discussed a month ago in another thread and you can see my reasons there:
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Well, another person uses my sig banner so 2 people might be getting their comments mixed up by some people who identify only by the signature. That’s why I suggest using avatars.
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The exact problem happens with avatars, they are no solution to this, in fact, it happens way more frequently with avatars than with signatures. We had this problem with avatars multiple time back in UDK forums.