Yeah, 生 is a good example. Fortunately, there are corpuses out there with hand-parsed sentences, so we at least train on those to pick the word for 生 on its own

Yeah, 生 is a good example. Fortunately, there are corpuses out there with hand-parsed sentences, so we at least train on those to pick the word for 生 on its own that's most common (I just tried - it's なま). We could use this to get our confidence even better than 50-50 for 生す. I can see how giving users more options could just bring more confusion. Such a tricky problem! I'll be thinking about this one.