Sorry Dozee, I have no clue who Coot is, an no clue what Coot's mix is.:dunno:
What I do know, is Neem has fungicidal an insecticidal properties, an I would not recommend it in an organic soil mix...period. To each their own.
Neem is great to use an organic pesticide...likely my all time favorite...very effective an very safe. But even with that said, I still only use it as needed, an very sparingly...it's still a pesticide.
As far as nitrification goes...if I were runnin 100s or 1000s of acres of crops, I might could see the benefit...but for a few sqft of soil, I'll jus add N.
I don't mean to sound like I'm knockin Neem byproducts, there jus so many other choices out there, why chance it when ya know you're addin unnecessary pesticides?
There are studies/abstracts out there that say neem is bad for humans who smoke cannabis that has been treated with neem.
XO posted the link and I will see if I can find it....