Kevin Morrell's dashboard

Much of the ID3 data for track length in my library is either blank or incorrect, and I was wondering if it would be possible to write track length data to the ID3 tags so that in case I lose my library, when I re-import my music, it will all be correct. What I've done in the past is play each song with missing time and skip to a random point in the song so that it displays correctly in Songbird, but after just yesterday moving all my music to a new computer and discovering all of my work was gone, I was hoping I would be able to write it directly to the ID3 tags so that this doesn't happen again in the future.

I know that there's the extension Tagger, but it doesn't support track length, and I've read about enabling metadata.ratings.enableWriting, but there doesn't seem to be something along those lines for track length.

Thank you.