export mpeg2 with subtitles from dvdsp?

I have a dvd-project with one film-track, one audio-track and one subtitle-track.
I want to export this (video, audio & subtitle) into a mpeg2-file. How to do this?

I have tried to export as a dvd (build) and then tried to convert and mux the files in both Cinematize and Mpegstream clip. Nothing works.

Can I export from dvdsp the subtitles into final cut? Or can I import a .stl-file into fcp? Is it possible to import in any way created subtitles in dvdsp into fcp?

Is it possible to export anything else then DVD (vob) from dvdsp?

I found a solution...
I made a DVD in dvdsp. Open the DVD in Cinematize. Exported a subtitle movie, without picture and audio. I imported the subtitle-quicktime into after effects and made a sequens suitable my projects settings and exportewd an quicktime with alpa-channel. Imported the new quicktime in fcp and sync together with my movie then exported a muxed mpeg 2 thru compressor. This REALLY *****!

Wonder why you cant export subtitles-tracks from dvdsp to fcp? It would be great if you were able to work between dvdsp and fcp like you do with fcp and motion.