Scott's Tweaks Mod 1.7.10, 1.7.2 adds several of my favorite gameplay tweaks to the game.

• Live chickens drop feathers as they go about their lives.
• Growables (saplings, etc.) plant themselves if possible.
• Clay generates in the overworld (not just in lake bottoms).
• Squid and bat spawning can be reduced or disabled.
• Endermen drop the blocks they are carrying when they die.

Download Scott's Tweaks Mod 1.7.10, 1.7.2