It's not a hack. The system allows you to "Lock On" to an enemy ship. After that, your camera follows them when you zoom in with the gunsight. You put your reticle wherever you feel the lead on the enemy ship is correct and you fire.
Normally, you keep looking at the enemy ship and you adjust the reticle a little to respond to whatever they do, but sometimes they just sail in a straight line and you don't have to move your reticle at all. So, extrapolating off that:
You put the reticle where you feel you need to lead your target, and then if you Free Look with the right mouse button, the reticle stays in the same spot relative to the target. The "lead" stays locked in.
If the enemy ship speeds up, slows down, turns in, turns out... any of those things will make your aiming off and require you to go back and re-aim your reticle again. Still, it's useful to keep your guns firing while you pop your head back with Free-Look so you c...
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