Additional option for world creation, more biome diversity setting.

I would like to see an option for biome size in world creation options.  I don't think I should have to travel thousand(s) of blocks to find a jungle... or a swamp (in another direction).. or deal with nothing but birch (or pine) forest as far as the eye can see.  Basically, I'm sick of having to create and delete worlds for hours to find one with a good variety of biomes.  Prior to the "unlimited" world size, there was a setting for biome density, I just want it brought back.