Sometimes I write answers and use fancy Greek letters which fools naive people to think that I am a Mathematician (which I am not). So I sometimes put a disclaimer in bold (e.g. Disclaimer: I am not confident, I made this answer only after thinking for 30-60 minutes).
I think such confidence disclaimers are helpful to be a good stackexchange citizen to make the lives of others a bit easier.
But at the same time, putting such confidence disclaimers manually is not elegant.
So I think that it would be nice if, each answer, has a drop down menu that contains a list of confidence scores (e.g. "little confidence (just started thinking)", "moderate confidence", "high confidence (expert)") with the the default value of "unspecified".
Choosing a value from this list would cause the answer to be represented in a different way to indicate the self-claimed confidence degree of the guy who answered the question.
But when the default confidence "unspecified" is chosen (which is chosen by default), everything works as normal the way stats.stackexchange.com works as if this feature doesn't exist.