I still think i got a good point (Sukasa idea). Both pipes from the bottom or top put the items in and both pipes from the sides extract the items.
That's how they work. Only problem is this: depending on their direction, they feed from slots 0, 1, 2. The Induction Furnace has 0 through 4, which leaves 2 unseen by the pipes, making it capable of only half power that the IF can deal with. The whole issue here is to possibly get the pipes to interact with the other two slots, making it more effective and simpler to use.
Edit: This is mostly extrapolation, from what I'm understanding from seeing Alblaka's post along with what I've seen first-hand with BuildCraft.