First of all, i want to say your mod is incredible and very hand not only in early-game but in late as well!

Well, after playing for a while I realized that i've already had @pcal43's Copper Hopper on my modpack, and due to the clearly conflict (two cooper hoppers would make things confusing), i decided to remove that in favour of Omnihopper.

But the idea of a filtered hopper is interesting, so why not implement on your mod as well? Maybe combining an existing hopper with an iron bar?

My concept for this mod is to stay close to vanilla mechanics and logic while twisting them in interesting and unique ways. A one-block filtered hopper has been done many times before, and does not really fit into that concept, so I have little interest in adding it. A similar thing can also already be achieved using omnihoppers and vanilla redstone logic.