When I was ripping an extras disc, with DVD-Decrypter, selecting "demux", each time, it got to be quite a pain in the ol' carpel tunnel.
So I poked around and found you can set demux as the default.
Tools -> Settings -> Stream Processing Tab
Put an asterisk in the "demux" box.
(IIRC, you have to clear an asterisk from another box).
It's been a while, but I know DVD-Decrypter forgets one of the defaults, every so often, and I think that's the one. So you have to check up on it, each time. But that's still less clicking than setting it for every fraking one.