Hi! Thanks for sharing your thoughts and suggestions.
The two player mode you described is something I've never considered but it's an interesting idea. But indeed, adding true multiplayer at this stage seems unfeasible.
Regarding streaming a window to player 2 without showing the inputs of player 1, a workaround comes to mind which might already work: player 1 types TIMELAPSE01 to save an image every second into the img/ folder. Player 2 uses IrfanView to automatically view the lastest image in that folder (the option is called Hotfolder). This creates basically a second screen although it requires some extra steps and cleanup afterwards.
The scenario mode could be used to create a game that can be rewinded/restarted with the same planes/callsigns in each run. The event list allows for specifying the callsign and plane type. In this case, self-made flight strips could be used.