I would love to see nuclear furnace integration with create, like making funnels able to input and extract items, and maybe using it as a heat source for steam engines.

I'll have to take a look; normally, Create funnels should automatically be able to input/extract from other modded TileEntities, maybe the 2x2ness of the nuclear furnace is making this not work

So it looks like chutes can output items from the nuclear furnace (as long as it is placed under the bottom-rightmost block of the 2x2 multiblock) but are unable to insert ores, barrels or nuclear rods.

However, hoppers seem to be able to input/output from the nuclear furnace as intended. I think this issue is better resolved by Alex himself, although his github is flooded with requests and issues at the moment