hi kim,
as I´ve written before. it´s quite easy – you don´t need to think about PAL-DVDs as pal-player could easily read/play NTSC-DVDs, and I am living in PAL-country (germany)
it´s a common workflow to create NTSC-DVDs for the int. distribution so all regions could playback the DVD.
if you are comming from PAL, it´s more complicated, as you need to convert to NTSC for int. distribution.
it makes no real sence for you to cross-convert to PAL, as NTSC is 720×480 and PAL is 720×576, so you need to to do a small upscale besides the 29.98 to 25fps-crossconversion.
just my 2 ct (euro) 😉
danny