Any chance you can make a configuration option to only allow nuclear science to be crafted in the atom forge? I like the equivalence with the other planet-specific buildings/sciences.
I would love to. But I don't think I can. The atom forge tech requires nuclear packs to research, so there has to be a way to craft them to unlock it. That's the centrifuge. Of course, the real solution would be to make the nuclear science pack technology require the atom forge technology and have that technology triggered by making a reasonably complex Nauvis export product -- that would be more in line with the other planets. So U-235 becomes analogous to tungsten carbide and holmium plate, and the Nauvis export product is analogous to tungsten plate and superconductor/supercapacitor.
But there isn't really a complex Nauvis export product available in the game, and shimming one in is a pretty hard design challenge, because it has to be useful elsewhere.
Another possible way is to remove the centrifuge entirely and replace it with the atom forge. As it is, the atom forge makes the centrifuge pretty redundant, and it was already a very niche building. But those graphics were too good to turn down, so it got included. Removing the centrifuge probably won't happen, since if I do that I'm giving up compatibility with any other mod that touches uranium production chains, unless I do a lot of code to support them.
If I come across an idea that seems workable, I will certainly consider implementing it. I just don't know what that idea is yet.