Yes, with limitations. DiscWelder Bronze is the only package I've seen that can do it, but there may be others. The main limitation is that the MLP - the lossless compression used by DVD-A - is not supported, so you're limited in terms of what formats you can put on the disk. I think you can do 5.1 at either 44.1 or 48, or you can do stereo at up to either 96 or 192. 'Real' DVD-A supports 5.1 at least up to 96.
I don't believe that it includes much in the way of recording/manipulation tools, so you have to have the 5/6 tracks already available as .wav files. I don't think it adds a normal DD soundtrack, so it's only useable on DVD-A players, not dvd players (I could be wrong there)
Still, at only $99, it's not a bad deal.
