Currently, a short, machine-identified-as-seemingly-low-quality answer is automatically converted to a comment on the question.
gbn has suggested in a comment that this be "weighted for, say, user rep". I'd like to propose that formally, so am opening this feature request. Specifically: Any user with 10000 rep or moderator should not have his short answers automatically converted to comments. Such a user recognizes what makes a good answer and what doesn't, and if he decides it should be an answer then that should be weighted more than the autodetector. (Of course, the answers could still be moderator-converted.)