The option to "get from the internet where available" would also be cool to help clean up files.
My experience is that "get from internet" instructions cannot be relied upon, are all too often "dirty"...
spelling mistakes, incorrect punctuation, totally incorrect information etc etc etc
For example, about 75% of my audio library contain lyrics. These were batch downloaded from various "get from internet" sources and every once in a while I spot tracks tagged with the wrong lyrics...
I don't know how many, if any, others are wrong, and I'm not ever likely to be so bored as to set about checking them all manually. My experience tells that if there are any other errors in there, they are very few indeed, though I'll never really know...
such is the nature of "get from internet" in my experience...