As an avid online ATC(VATSIM) I've been playing around with the idea of controlling from inside the tower cab. It is possible that you can adjust the FSX multiplayer control tower to be select-able as a single player aircraft therefore being able to use Flyinside.
To connect to VATSIM you simply start a proxy server on the ATC client which is done by one click from inside the client, then using the pilot client inside FSX you simply connect to the proxy client and you're connected and now able see the VATSIM multiplayer aircraft inside FSX.
I know you can access a web browser from inside Flyinside but what is the possibility of begin able to access a 3rd party software like a VATSIM ATC client?, which then can make it truly capable of being an immersive Tower controller.