rs008f,
ChangeFPS won't help, will make the video go faster and this is not what we want. What pulldown does is enable the 3:2 pulldown flag in the MPEG file, so the player converts from 23.976 to 29.97 fps when playing, on the fly. About the CCE pulldown detection, I never used, but I guess it is safer to use pulldown since your movie is all telecined (no hybrid material, part telecined, part trully interlaced).
Since you're doing this kind of conversion, why not check my guide here:
http://www.kvcd.net/forum/viewtopic.php?t=5142 . This way you can put three movies in one DVD.
[]'s
Vmesquita