A computer program on Windows/Mac to let the owner of the car manage music on the USB media from a computer on the same network as the Tesla. Even setting up and arranging the music “offline” would be great, and then have the car sync automatically whenever it connects to the same network as the computer running the application.
I don’t know about any other cars having anything like this, but just about any smartphone has features like this now. Should be a software issue only, I think. To prevent other content of the USB stick it could care about only a folder named “Tesla” or something like that.
(lightly edited by moderator)