rm is technically not an audio-only format, it supports both audio and video.
Switch supports ra and ram, but we haven't tried rm. You're certainly welcome to try it though and let us know if it works.
we mainly designed the command line tool for integration into other software, so it is not always the case that someone is using the tool by typing from the command line. Currently therefore we do not detect for the folder the user is typing from. We are certainly happy to look into this situation and come up with some sort of solution for a future release though (we might add a default folder option or something like that).