Although, I would be the first to post the incorrect answer, I think it's still a good idea. As I've seen in the CB a number of times, first it allows you to check your knowledge, as the masters pat you on the head and say, "No no.. Do it this way because of x." and often times it stimulates ideas.

I do agree, that you need to say this is not tested, or to the best of my knowledge, thus qualifing your statement. Though still, I feel, it is helpful to post what you know, and maybe; with what you say, and what the person who's asking the question knows, they may be able to solve their own problem (a win all around.)