[Venlo]

While I was doing BR, one of my shellmates mentioned one of his friends having told him about some sort of add on or .dat swap that allowed him to see whether a rampart would spawn NMs or just be a dud. He didn't know anything about it, and wasn't able to talk to the friend, so I figured I'd ask here; has anyone heard of anything like this?
If so, is it similar to the ZR .dat swap that enables one to see which half of the mobs carry cells, or something else? Any help would be greatly appreciated.