Everybody wants it, but nobody's mentioned it. It seems a logical continuation now that we have the Enemy Editor.
I think this could be implemented fairly quickly, provided that we don't allow the creation or deletion of Item Drop Lists, or the renaming of Item Drop Lists. What do you guys think?
Also, we should convert the hard-coded "Bush/Tall Grass item drops" into an Item Drop List, allowing people to reduce the heart/rupee output of these combos.