On a few SS, FB Aimbots I have, when you Select the target, I think that the aimbot just tracks their co-ords using packets, a little like COTOB does with the player notification. Infact, I dont think that that would take a lot of editing to turn it into a packet based aimbot. All you need to do is implement a targeting system and when the target is within range set it to FB/SS. It might not be as good as you imagine it to be if u have a laggy computer.
I'm not altogether sure about what I stated above though. So don't go around asking people to attempt it. It might just be a big waste of time :\
Maybe ask chocoman4k if he is willing to share the player location thing he has in COTOB?