This is something I have wanted since LOMAC.
I did send an email to the devs with the reply "We will look into it" or something of that nature.
Everytime I booted up FS9 or FSX it was to formation fly with FSRecorder, it worked really well except the fidelity of the physics/controls didn't allow you to fly with the same accuracy as you can in DCS, but it worked.
You can kind of make the AI enter a turn smoothly-ish but it is still dodgy. For example, you can set a turn commend that starts at 10 degrees bank, get the AI to hold that for lets say a 3 degrees heading change, set another turn command for 20 degrees bank, and hold that for 8 degrees, set another turn command for a 30 degrees bank and hold it for 15 degrees etc and then do the same thing again but in reverse to transition back into straight flight.
But, it would be better if we had for each maneuver a 'transition time'. For example, you command the AI for a 3G turn, and you can set, lets say 5 seconds for 'transition time' so that the AI takes 5 seconds from when the it starts the turn to when the AI is finally at 3G. The same could be done for climbs and descents too. This will let us make the AI behave more naturally instead of instantly going into an instant 3G turn that we can't keep in close formation with.
But, one of the most fun things with formation flying is not just the flight itself, but the formation takeoff and landing.
Even though I would love (1000%) to have a FSRecorder style formation flight with myself in DCS, that would be, for a lack of a better word 'heaven', I think adding 'transition time' for maneuvers would be easier than implementing the FSRecorder style formation flying.
But, now that I have said that, why can't we have both?