Those two might be tricky, if ever possible.
A command to list Crucible Heat source and Infusion Stabilizer block with value?
Even harder, Crucible Heat source and Infusion Stabilizer add/remove function?

I think with this, most of Thaumcraft support would be complete, again, IF those are possible :)

Unfortunately these are hardcoded as specific blocks, and while mods can implement some interfaces on their blocks to make it work, there isn't an actual registry for it.

Thanks for the quick answer :), that what I thought it'd be :'(