After toying around with your new mod (I like it =), I had the idea of spawning those Leaf Piles that come with Biomes O' Plenty as they are already at hand. I think it would be a good idea to trigger a leaf pile spawn when leaves decay, maybe with a random chance of 1/25 or 1/50. When it's decided that a pile will spawn, simply going down to the next solid block and checking that no other things that are in the way (eg. flowers) should suffice. Thanks for your effort, anyway! =)

That could be cool, I might look into adding that at some point.

please no ... i have already customized every biome to not spawn all the BoP bloat garbage, and random BoP grasses and dirt blocks , useless mushrooms, leaf piles, etc ...

Well, you can suggest a config option to disable it, but if others may like that change theres no reason they shouldn't have that.

Bloat especially in useless items just causes floating items ... which affects your performance till items despawn ... or you pick up the garbage

...or you edit the config to not put garbage in your world because that's how you like it.