Question: Has there been any discussion about denoting the experts of certain topics, for example MVPs or Microsoft employees in the small profile icon? 

This way users can quickly distinguish between random internet morons like myself, and the ones accredited with their chosen speciality?

Answer: 
Why can't these users simply put this in their profile page?

These things shouldn't make a user absolutely trusted by anyone anyway. Voting should be done based on the quality of the post, not the user.
Put the information in your profile. 

From what I have seen, most people are pretty forthcoming about their information and I haven't seen much in the way of posers and fakers.