GregoriusT, Please take into account this small suggestion. You can make 2 minor changes with deep and meaningful result. And it may be better to do while moving to new version with new save system since no contradiction between old recipes and new one may arise. The first suggestion is to rename Pu-244 to Pu-238. It is Pu-238 because of it's low half-life is hot enough to be glowing red and can be used in RTG fuel. Pu-238 is the isotope of Pu that is contained in spent nuclear fuel and it can be separated from fuel rods just like in IC2. It matches existing crafting recipes perfectly.
The second one is to rename Pu-241 to Pu-239. Pu-239 is the isotope that really can be separated from Pu-238. You already have this recipe: Pu-244 ---> Pu-241 + U-238 where Uranium is a decay product. To be correct you just need to rename two Pu isotopes. So the recipe will change to Pu-238 ---> Pu-239 + U-238. Pu-239 is less useful in nuclear science and less radioactive, like you in-game Pu-241, so it will be really nice to rename Pu-241 to Pu-239.