Not a reliable one, no.
 Maybe, maybe not.
 Just use the correct settings. There is only one choice for format (WAV Stereo).
What you want to do:
1- Play DVD in PowerDVD. Take notice of the chapters of the audio you want.
2- Rip in DVD Decrypter
, in IFO mode. Only rip the chapters you want, by selecting or deselecting the boxes.
3- Convert the assumed AC3 to PCM WAV stereo in Besweet or another AC3-to-WAV audio tool. FFMPEG is another one.
4- Dump WAV audio into an audio editor like SoundForge
. Edit as needed.