OK... I'm not sure if I'm getting this right... Are you saying that you target a ship, and then the game automatically just puts brackets, and maybe a lead indicator, on whatever ship is closest to your reticle?
If this is true, then it might be vaguely handy in an escort situation. But, as I have both the escort-target and reticle-target buttons mapped to thumb buttons on my joystick, it's practicality IMO would be limited.
However, in bouncing this idea from A to B to C, I just got an idea... Let me think about it for a while, before saying anything more...