Only stream half of the session for split-screen games

Is your feature request related to a problem? Please describe.
The ability to multicast an ultrawide session and having it split on two TV's would be great for split-screen games that support ultrawide resolutions.

Describe the solution you'd like
If pressing and holding the A-button on the connection menu, it could just create a simple popup asking for "Left or Right" - a better solution would be to have multiple instances of the same host-computer, with (left) and (right) displayed in the name with some sort of icons only showing half a screen.

Describe alternatives you've considered
Having sunshine implement something serverside - but that would require two seperate streams with their own handshakes, encryption, etc.

Additional context
I don't know which decoder moonlight uses, if it is ffmpeg it may already have an option to only show part of the stream.

Start at the connection menu and investigate the press-and-hold A-button interaction, then identify which decoder handles the stream. Determine whether the client can display only the left or right half of one ultrawide session without requiring two handshakes. Done means both halves can be selected and rendered on separate TVs as described.