Tag&Rename can edit "MusicMatch" type id3 wave tags. Also their free AudioShell shell addon can. This is a full id3v2 tag at the end of a wave file including artwork etc
dbPowerAmp can edit LIST chunk type wave tags. This conforms more to the original wave standard but only handles id3v1 tag fields.
There doesn't seem to be an agreed upon wave tag standard yet? Everyone is doing their own thing.
I wish mp3tag would support the Musicmatch wave tags. Maybe one day?
That's what I was kind of hoping, but yea, maybe one day.