The F7 functionality is broken it is supposed to display where mobs can spawn, can spawn at night or where they can't spawn it does not work any more please fix this.

Set to draw from the vanilla spawn system. https://github.com/Chicken-Bones/NotEnoughItems/blob/master/src/codechicken/nei/WorldOverlayRenderer.java#L71

No current way for me to replace that as it is static.

Disables itself whenever spawnlist is empty, which it is by default in JAS. But doesn't care about the contents as it just marks based on light level / typical spawn conditions irrespective of entities actually present in the spawnlist. Nothing to be done.