double post cause emitters
artillery shell is now just one really accurate one (but if you're moving you won't get direct hit, e.g. in a vehicle)

its pretty well refined atm so if anyone has any suggestions now's the time.
i may split the "artillery" portion into a second item the player has to be carrying that's a one-time-use item.
if anyone wants to provide a homing rocket launcher mod, I can make it work with this.
for reference, the target position is %player.target, type is %player.targetType ("NONE", "BRICK", "GROUND", "VEHICLE", "BOT", "PLAYER"), and original lock-on position is %player.targetPos