Not for me as I don't ever play my tracks before they're tagged (aside from the occasional typo), but perhaps someone would find it useful.

A feature similar to the current Auto tag from Web feature

Have your songs playing and search (a preselected search site) for song details. Similar to Auto tag from Web, just it is in the Now Playing window itself. If a match is found, the currently playing song line is turned yellow with the modified tags (again, similar to Auto-tag).. have a check box next to the song which would save the updated tags.

Would save a lot of time and would be very convenient too.