Export Quicktime Movie. (if you are working in DV NTSC timeline you might consider copy/pasting to a ProRes or Uncompressed 8bit timeline first to avoid DV codec artifacting).
Take that NTSC Quicktime into Compressor and select a PAL preset from Advanced Format Conversions. Do Not try to go directly to MPEG-2…go to ProRes or Uncompressed PAL. Turn on the Frame Controls and set the resize and rate conversion to Better or Best. Expect a long encoding time for this. This will give you a PAL file. Take that PAL and select an MPEG-2. DVD preset and encode your PAL asset for DVD.