Took a read in the core book just to check, and I think you're overthinking it.
The way I read it, 'sensetive sensors' give a bonus to all rolls the sensor operator makes in their turn, no exceptions. (well, data djinn rolls while in front of their console of course)
If it's OP? nah, remember, it's a feature, not a module, so the price is a percentage of the total cost of the ship, so it can get pretty damn pricey. And +3 is still 3 dice, not 3 successes, that's a feature of the system - the dice rolls can go either way.
And we already have similiar feature for most of the other roles in the cockpit: the pilot can get bonuses from 'turbo projectors', and the gunner can have 'advanced weapon systems' (only the poor captain does not have something to boost their command roll ... maybe drugs?

)
tl:dr: don't worry about it, it does exactly what it says.