So I think sheep are useless. The only thing I use for is wool for is a bed or trading, I don't really use paintings in survival. I think that they should drop lamb chops, or more specifically raw lamb. It would make more of a use farming them and it would make survival a little easier. The first thing I look for is wool for a bed so it'd make hardcore mode nicer. Just a thought me and my friend had today.
I had the same thought at a time, bit people are going to dump on you about it makes things easier (they don't like that) but it is a good idea, may have been suggested before, not sure.
Enderpearls need more uses! Go to http://www.minecraftforum.net/topic/1584591-ender-dust/ to fix that!