Is there any way to extend each device context with more features, using some sort of addin? The options i see there are pretty basic. For instance, I use some addins that allow me to manage any Mytek device settings remotelly. It would be nice to be able to integrate it with Device Settings inside Roon. Has Roon any documented way to integrate addins/pluggins? It does not matter for me whther the addin is located on the client or on the server side.
Not in the context of what you are asking for. Roon does allow extensions through its API. Try looking under Tinkering to see what is available.