had similar issue/concern. ideally if enough people mark something as correct, the variations and slight differences will get merged together. it did still bother me a bit, as being able to add a bit more extra data would probably be helpful. but... maybe they can add some geo-ip data - respondents from various areas would probably mark more stuff 'correct' from their own region. ???
Being able to mark something 'close', or rate it (1-5, maybe) would help. Just heard an indian accent reading "It's such an unfair world, innit?" The words are... correct, but 'innit' is somewhat idiomatic (especially spelled out that way - seems more UK-oriented text). The pronunciation was "correct" but "awkward".
Also... (too lazy to check right now) - if I create an account, can I see the 'yes/no' ratings of my own submissions?