Joining the club. I really cannot believe this feature is not implemented after so many years. I bought Roon somehow assuming that is possible to use it on the go - my bad, should check it before.
I understand that communication between mobile device and Core may be not trivial but there are simpler solutions. What about allowing a local copy of library on mobile device, without synchronous communication with core? Local app would collect all usage data on the go and then pass it to the core for processing when back in local network.