Sorry but DVDPro Ex sucs BIG time ! Most of the time you cant even install it, let alone use it.
@Radioactiveape, both SmartRipper and DVD Decrypter can rip individual Chapters of a DVD. Best is to also demux them when ripping to their individual Video & audio streams (just enable Stream processing and tick the demux box for both streams.
You can then use Maestro, DVDLab or TMPGEnc DVD Author to load each Video & audio until the DVD would be full, make a simple Menu and author to a set of VOB files.
These is no real short cut for what your doing, just stighlty different software to do the job.