Patrick,
In listening to your description, I assume the front mounded feature is not directly behind a bunker, correct?
Steve's example at LuLu is a bit more treacherous (unfair to a front pin, perhaps?) because it takes away the low, running option that just reaches the crest and continues onto the green.
The 8th at Merion has a similar feature, once again due to sand buildup from the fronting bunker.
William and David Gordon also designed quite a number of greens where the bunkers (although usually not directly in front, but more diagonal) are actually raised to the highest points, with the green flowing down away from them. In a way, this type of feature acts somewhat as green "containment" on approach shots, but you don't want to be short-siding yourself on their courses.
Patrick, it sounds like a fun and interesting feature utilized properly. I have played Sean's example at Hartefeld, and I'm not sure it's what you are talking about. That green is more on a raised, elevated shelf, falling off sharply off the front, but the green itself is relatively flattish. It's a good hole, and a neat concept, but if I understand you correctly, Patrick, the shelf is on the green itself, correct?