My suggestion is to use CAs radar system on the Phantom II, for the copilot. In real life, the second seat was a Radar Operator, in charge of locating enemy aircraft and achieving a radar lock on them. In addition I would suggest a "realistic" portrayal of the Sparrow Missile under the copilots control.
So the Pilot would control the actual flight of the jet, and the Sidewinder Missiles, while the copilot would have the free look, radar, and Sparrow Missiles. The Sparrow Missiles would be controlled in a manner similar to CAs bomb drop system, where the copilot would need to keep the reticule close to the target in order for the missile to maintain lock, similar to real life, where the radar operator needed to keep a radar lock on his target because the missile didn't have an active seeker.
Sorry if I'm jumping the gun with these suggestions.



