Hoppers should be able to put and pull items in/out of Ex Deorum's blocks. Not much else to say, but it would be a really nice feature and massively improve usability in my (and other's) modpacks!

Hoppers already interact with barrels and crucibles. I will not add support for the Sieve for balancing reasons.

Hoppers can already interact with barrels. Is this not the case?

I'll add support for crucibles too.