Quote from ivyn
I would like to know what all of them are, so I don't get the impression that you're blowing smoke that there are that many good tweaks to vanilla that BTW makes that the majority of the community would like.
The things i value most:
Mossy Cobble Farming.
Animal Breeding Tweaks
Limited Pig Men, Slime and Magma Slime Spawning
Mossy and cracked stone bricks can be made by running water/lava over it.
Villagers drop XP.
Babies Can't Jump:
Note: I have the feeling a few tweaks are missing from the OP. Like the ability to make mossy stone bricks and cracked stone bricks by using water respectively lava.