If you've used the tag & you want to see if it has been fixed try using the code in the scrobbler
lastfm://user/yourusername/personal/tag/wrong track streaming . Though this will also pick up tracks in YOUR library which other people have tagged.
@riffic -no reply from staff in 2 years, so I guess 'NO!!!' is what they're saying. I think the best chance of getting anything looked at is to shout on the forum during office hours & use a link to the offending page and a good description. http://www.last.fm/forum/21713