Could there perhaps be a simple system that would color just the last bit of the vertical stab a color of the player's choosing to indicate flight lead? No real use other than immersion, and right now, at least in our squad, we have to use a different skin than the flight lead to get a similar effect. I imagine it wouldn't be too hard to implement, it would just be a solid color overlay that would be applied over the current skin.
Something like this! The blue on the vertical stab (not sure if that's it's purpose in this case, but that's my thought!).