Internal Furnace Usage

Is there some way we can make the process of consuming items go faster? "E"ating items one at a time is slow.

You can always use ‘=’ to change the stack in question to the E hotkey, then hold it down. This is how I take a stack of 80 vitamins in only a few seconds without getting carpal tunnel.
Note that with some things this can go horribly wrong, causing vomiting or death.

That or "w"ield you vitamins (don’t do this with other drugs) and "A"pply it. Let go when you’ve had enough/ran out.