Thats exactly what we all, VPN folks, need. Let me specify IP adress for the endpoint, that’s all. But for now, i can control, but not get audio from PC outside the Core segment. But i CAN play music FROM different segments to the endpoint which resides in the Core segment. Sure, i use VPN between the segments without any restriction. More about that is here: No audio on Windows 8 Desktop [VPN and Private Zones].
I think, such a great software as Roon with the accent for the networked audio approach, must have such possibilities.
I know, Roon team planned to bring up some sort of remote control, without VPN, but this is, for sure, a huge work. For now, it will absolutely great if them just add to menu “Add Network Device” new option - Roon Endpoint. And give us to type the IP. System itself already working, it’s all about multicast discovery through VPN. If it will be done - I’m Rooner for life, for sure!