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I don't know if this has been suggested, but my most recent game lead me to believe that the implementation of a feature such as this would yield a much more enjoyable experience in the solo-queue world.
Our first pick had picked an ADC, and our fourth pick "mistakenly" instalocked Vayne and claimed that double ADC would work. All on our team were opposed, but no one wanted to take the penalty for dodging queue. So we played the game and lost horribly.
Now, if only there were a way to vote-kick someone for doing such a foolish thing, and place the remaining players back in queue...