What Should Be Added or Changed?

You said you'd know what this meant. I want to use it specifically to interact with the nuclearcraft radiation armor compatability, described in their config as "Radiation resistance can also be given to armor by changing their recipe such that an NBT tag called "ncRadiationResistance" with the double value equal to the resistance level is attached to it."

Why Should This Be Done?

It adds a lot of flexibility. And I'll give you a twizzlers.