It seems currently not possible to non-interactively use C2RAMLDR without auto-detection. It should be possible to specify all answers to the interactive questions via the command line.
Unless I missed something of course, then please directly close this issue :)
Triggered by this discussion: https://www.msx.org/forum/msx-talk/software/multimente-mm-and-carnivore-2?page=1
For reference see: RBSC/Carnivore2#84