If you were going to spend the time to put the DVD in, look at the VOBs using some PC player or something, and figure out what's worth keeping and which method to use... why wouldn't you just spend that time working the DVD Shrink menus?
See, I'm playing devil's advocate here.
The Linux tools suck. Any tool for which there is VERY limited demand... sucks. That's just how it goes. You don't want YET ANOTHER transcoder out there that won't be supported. As it is, there are now some structure protections that Shrink has trouble with even after AnyDVD or DVD Decrypter are done with them. It's only getting worse.
None of this means such a program CAN'T exist, but I know of none.