The first release is now available to download, new features are C# scripting and a configurable context menu and I've updated the website with a description and a image showing the new menu.
Feel free to ask questions about mpv or mpv.net usage and how to write a script or addon, if there is interested I'll create a development thread. There is a C# and a VB.NET addon included.
https://github.com/stax76/mpvnet