Mapgen and singlenode are fine, since they're basically featureless. The mod is tuned for the terrain of v7 and won't work on the other main mapgens though - you'd get paths deep underground, in the sky, and so on - basically all sorts of inappropriate places.
It says, "Use with mapgen v7 only," but I'm using it with the flat map generator and it seems to work just fine.
Mapgen and singlenode are fine, since they're basically featureless. The mod is tuned for the terrain of v7 and won't work on the other main mapgens though - you'd get paths deep underground, in the sky, and so on - basically all sorts of inappropriate places.