Is it possible to make this only useable for a named/called shot i.e. you get a bonus to tricky shots or to do specific things.

So the DM could roll play the shot doing less damage but hitting the target exactly how you wanted to, e.g. you take aim at an enemy running away, focussing in on their left leg you breath in hold it as you loose the arrow, it flies fast and true finding its target. the target falls down and will take a turn to get up and remove the arrow before it can stand on the leg, but it only takes half damage from the weapon.