I don't know what you exactly asking for but i know there's a program called subtitler that will create subtitles and put them on to DVD.

and if you ask for DVD authoring programs then there are many out there but no one promises too much good.

sony DVD architect good apps but takes too much time to arrange all things together and also asks more space to burn. (personally i don't like it)
Ulead video studio or DVD factory ____ did you tried these softwares.
what about adobe premier.

sorry if i'm off topic.