G'day,
First off, yes I know it takes a long time to perfect formation flying.
What I propose is a panel/tool which allows the player to select an aircraft in real time, being AI or multiplayer controlled. Following this, the panel will "lock on" to the selected aircraft and control the player's aircraft and speed (essentially autopilot) in order to maintain formation. If the selected aircraft banks, climbs/decends or increases/decreases speed, the panel will also replicate this change on the player's aircraft, thus keeping formation. This would make flying F/A-18s and similar aircraft much more enjoyable because the sheer power and manuverability of these aircrafts make decent formation flying impossible except for the very best simmers.
I do not know how difficult or even possible this would be, but it would certainly help players and create a more enjoyable experience otherwise reserved for the more experienced simmers.
Cheers!