I made it so Newtonian gravity also affects lightning direction for my mod: github link. I also let it be made by anything, including clone, not just the brush like before.

@OmegaSupreme (View Post)
You should have said that first, that is a (very small) glitch. I noticed it too when making Newtonian gravity affect lightning direction, and I did fix it. In vertical gravity, there is a 40° randomness, but radial gravity doesn't have that, it's always exactly the same.
Hopefully Simon or another developer will put that commit into official and fix that, and also allow some cool new things to be created at the same time.