The same NJ air pollution laws that outlawed burning of leaves and other debris make it unlawful to conduct prescribed burns for any purpose other than fire prevention. When these burns are done, other management goals can be tied to them but they cannot be done solely for those purposes. The FFS does work with the land managers to help them achieve habitat management goals by burning hotter where possible. That much I can attest to as fact.
The other factor prohibiting the types of fires some would like to see is the fact that they would be extremely risky in a small, densely populated state where you are never far from development, and wind-carried embers can set fires miles downwind of crown fires. Imagine the hell to be paid if one of these got away.
As for the location of fire breaks, they have indeed been created adjacent to development. A break consisting of thinning rather that total clearing is being made as we speak along Pancoast Road, north of the developments along West Bay Ave. in Barnegat. But given the choice, where would anyone with any sense attempt to stop a fire, closer to its source or at the edge of development after it has gained momentum and spread across a wide front?