You say, a 'magic' passive short range sensor would make it impossible to board sneakily.
Well, this means, no one can sneakily board a miner and only get noticed in the very moment, when you kill the pilot.
At the same time you want Sensors, that will only work for you, when you are hunting minders, because you want even rangefinders to blind their sensors.
That is not pvp, nor healthy, as Recatek pointed out.
Boarding is a very diffecult thing, anyways. Boarding usually only works on very slow targets, that can't (anymore) defend against it. Well, it was a bit different in the age of sail, But that is far gone.
And even a 5 km 'magic' short range sensor, that would detect evrything still won't protect you from stealth railgun fighters, as the Railguns outrange those 5 km easily. And even when not: the miner would likely start to run, but getting moving pointing away from a roid, etc takes tme. Getting into range of your guns should be easy enough. And since you are chasing the miner, your hits would tear through his thrusters, making it impossible for the miner, to run effectively.
But which side gets the intel advantage is always diffecult to balance.
And I also get the same feeling as chaosrifle, that it seems, that FB is trimming pvp to only happen around station seiges. Which is too boring, and actually remove the need for sensors.