there is a way with dvd maestro,but takes a long time,
You need to encode all parts of the menu(set up,scene selection,original)
then you need to do all the sub overlay pics from the menus.
and a lot of other things
and do the subs with subrip,
put it all together with dvd maestro and you'll end up with a Video_ts and audio_ts folder.
it works,but takes some time to do.So your way with Dvd-RB Dialhot would be much better,if you find out how to do it.
Good luck with it
edit: forgot something, of course your encode have to be 352x480/576 or 720x480/576 and mpeg2.
-Tbo