I know this has been suggested before somewhere, but I can't find the thread. I just wanted to add my voice to this. +1 it, if you will.
When eating, drinking, feeding to piggies, giving to players, whatever... "All" should NOT be the first choice. "Just one" should. It is way too easy for a keyboard/mouse error to wipe out all 100+ of your item. Doubleclicks as mouse errors happen, and they happen frequently, and I just had my Enter key decide to press itself twice. These things happen, and players should not be held accountable for hardware errors.
In the grand scheme of things, it's not much, but it's extremely frustrating when it happens, and it seems to be an easy fix and a nice gesture by the devs.
So yeah. That. Thanks. :)