Yes that's correct. I'm using:
addOreSpawn(block, information.getBaseBlockForTerrain(), world, random, chunkX * 16, chunkZ * 16, 7, 10, 12, 2, 60);
which means 12 veins from 7 to 10 size between height 2 and 60.
Yes I will add something like this but in a future release...