Well, i had a look at the files related to crew dialogue, and... well, lets just say that it was very confusing, so, im sorry to let you down, but i dont think i can do this. if someone can change the subtitles, though, then scentence mixing should be the next step.
scentence mixing has changed this :
http://www.youtube.com/watch?v=sp5bi-82Ajs (if link not working, type harrybos grandad into youtube search)
to this:
(if link not working type rosen has no empathy int youtube search)
So, if you secentence mix dialogue to match the voice to the subtitles then smoothed it over, you cold incorporate it into the mod