2 things i'd like to see:

1st (not as hard as the second) Import Tags to Wav files via what the file name is... for example:

Michael Jackson_Thriller-Original Mix_Thriller_Epic Records

Would get the tags: Artist: Michael Jackson, Title: Thriller-Original Mix, Album: Thriller, Label:Epic Records

It could be setup in the preferences tab...Preferences: Character for separation of Tags, First Tag=Artist, Second Tag=Title, etc.....

2nd tag related thing would be a way to access the many internet databases for tags and get the information from there during overview building, obviously it would be harder as you'd have to have an internet connection, but then it would open up to be able to download Album Art for each track, or even Serato could start their own database, so it conforms to it's standards, obviously that would be a huge task