I think it would be cool if the community had some kind of tool (however blunt) to help smoke out liars.
This would be almost impossible to prove, and I don't see how anything can be improved with this.
You are always going t have liars everywhere, and I think most of the people here told some lies for various reasons, most obvious is privacy.
Some could say that Satoshi was the first liar, when he said that he is a man from Japan in one of his profiles
I had a very specific thing in mind when I thought of this (the recent naim027 drama, which is what got me thinking about honesty).
Naim027 is an asshole and abuser, but that is why we have trust system and it works good with cases like this.
When I suspect someone doing stuff like him I could add in my personal Bitcointalk UserNotes script, or write in in public on his profile.
I'm against reckless tagging and don't want to encourage misuse of the trust system.
Any tool you would use instead of Trust system would be public, so I don't see any difference here.
You can use Bitcointalk UserNotes script if you don't want to make your notes public.