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Personally, I think the idea of having custom heroes is poorly implemented. But if we're talking about it, then modifying them using tools not provided by the standard map editor, I consider that cheating. In essence, it doesn't really matter, because your opponent sees who they're playing against, and if they agree to play, they can't really complain. Or they just don't play. I've been ignoring any non-standard heroes lately, not just those that have been manually modified.