Not as an automated tool, but if users could set their "experience level" within their favorite tags, it might be helpful to gauge the verbosity of answer needed.
I usually head into answering a question with only an assumption of the OP's understanding of the language/problem/framework/whatever. This regularly leads to me going back for numerous edits to add more detail (or lengthy discussions in comments).
The experience level could be shown in the tags on questions:
And people could recommend upping or downing someones experience (anonymous? earn exp vote points?)
Couldn't find any other discussion about this, so if there is and I missed it, apologies.