Import of http://bugs.musicbrainz.org/ticket/2721
"When entering a label you can enter a short text string and it presents you with a list of relevant labels. It would be neat if you could enter a label code and have the same thing happen.
I think this would also help when multiple labels are mentioned on a release as I assume the label code will be associated with label people are supposed to enter.
At the moment you need to click away to another screen to check which label is related to which code."