Currently it is not possible to use two separate integration table recipes. One is prioritized.
I am trying to add two recipes which only differ in the expansions. It will be difficult to compress that down (but possible)
Is this the intended behaviour?

Yes, it's one recipe per main input item, but you can return a different output depending on the expansions that are passed in.

yeah, it is tricky but possible, still need to rewrite the BCA kinetic multitool stuff to work with it fully

That is what I am trying to do now @AEnterprise . Because the Stick integration should require a stick and a chipset and the upgrade integration only requires an upgrade, the NEI recipe handler crashes because BC(C)/NEI tries to put the upgrade and the chipset together which crashes beacuse the recipe returns null

For now I will just make them all require only the stick/upgrade

yeah tried that before, the sytem needs a full rewrite, sadly real life kicked in then, though if you wana talk about this more, make a BCA issue, this isn't the best place to discuss those things

This is intentional.