Based on the problem at http://forums.musicbrainz.org/viewtopic.php?pid=32214#p32214 (and I seem to recall seeing this previously as well)...it seems to me that it would be a good idea to automatically apply the track durations from discID if a release has only one discID connected to it (or if the durations on several discIDs are the same within a second).

This should fix the scenario where someone looks up their CD, finds its discID attached to a release, and then finds that the displayed durations are different from what their ripped tracks/discID have. Doing this manually is hard to catch and is mostly just silly busywork, so automating it makes sense.