I used dvd-lab pro v2.? It didn't complain at all. It recognized the file as PAL, 25 fps 2:3 pulldown (but it still is 23.976 fps progressive). If I open a 23.976 fps progressive NTSC file with pulldown in dvd-lab it is recognized as NTSC, 29.97 fps 2:3 pulldown.

I got this method from boon23. I think he used it to turn a PAL movie into NTSC without having to mess with the audio. I think he resized the NTSC video to 720x576 at 25 fps and applied 2:3 pulldown to 29.97 (setting: "25 --> 29.97"). It was a long time ago in a thread here at OT.com but I can't remeber what thread.