Please Consider :-
Is there any possibility of a SDK / API to be able to access (Read only maybe), MSFS MultipPlayer "Local Players" via simconnect
This would allow addons like "Litte Nav map" to be able to display MP Traffic, as well as the possibility of developing other items, such radar system, as are present in FSX & P3D,
Not looking for a FULL MP SDK (to inject objects Into MP !!), but just enough to be able to read data for "Local Players" In a MP session.
Basically, info to put MP targets on a map, with data tags, and basic plane information and cockpit instrument states, ie Transponder code, COM1 & 2 Freq and active, -- maybe even Departure & Destination ICAO codes.
Or build a menu addon, that could include Local MP Players, with names, plane type, ICAO, distance , LIvery name
Note: World Map is already able to see Local Player MP traffic (in a limited way)