I decided to put my thoughts towards making a 16-channel version of 'Mickie', my MCU-compatible Layout...
What I've realised is that addressing more than 8 DAW channels under the MCU protocol is the result of the sending device presenting multiple MIDI ports to the receiver. In Cubase, this would be achieved by having two MCU remotes defined, and each receive from a separate MIDI port. Cubase determines that two MCU remotes are actually a master and an extender and magically begins working in banks of 16. I guess that other DAWs will do something similar.
I can create multiple ports in WinRtp, and I could presumably simultaneously connect to these ports in MD, but there's no option to determine which port an individual MD control sends to - I guess it would currently send to both.
And then I also began to see that if MD *could* separately address multiple ports then there's the potential for Layouts interfacing with multiple target devices. How about a Layout that controls five or six synths, achieved by appending Layouts and defining the port for each appended page/bank? An entire rig under one MD Layout!
At a lower level, if an individual MD control had the ability to target the port with which it is associated, then my 16-channel (or 24, or 32!) Mickie becomes a possibility.
I realise I'm probably asking for the moon on a stick, but... Maybe a consideration for the future? Or am I just talking nonsense?