I have never played Minecraft, let alone modded, and I think many others here are in the same position, so it would probably be helpful if you provide a graphic example (image or drawing), or at least describe what you mean.
I suppose a second row specifically for fluids could be useful. From what I can tell, a fluid doesn't count towards the max items input count of a recipe either, but I might be wrong on that.
Creator of Bob's mods. Expanding your gameplay since version 0.9.8.
I also have a Patreon.