This order would use a -100 to 100 slider.
On 100, the ship would strongly prefer to sustain it’s fire on a single target. On -100 it would strongly prefer to move it’s fire between targets frequently.
I see the most use out of the -100 order, to have ships that spread their love over as much of the enemy fleet as possible. This would be most useful for dedicated armour breakers or EMP vessels. I suspect it would also be useful for antifighter missiles (as it would hopefully result in each missile targeting a seperate fighter, resulting in less wastage (when you fire 6 missiles at one fighter, you’re often wasting 3 or 4 of them.) It would also look cool.