You can do subtitling in FCP. I have never done it. I think most people use the title area in FCP. I receive four hour plus interviews I have to work on and it would take forever to do it in this manner. I can now do a 2 hour interview start to finish in about 5 or 6 hours. I use Annotation Edit. After I finally figured it out, it is very fast and accurate. After making the titles in A/E you export them out as an stl file. They drop right into DVD SP. I do a final spot checking before sending it out to a DVD.