I would like the option to Turn Dimensions On/Off for SP worlds, as to prevent friends to go to, the nether for instance, and lagging your LAN
Also, Emeralds are coins, no need for armor and weapons, MAYBE they can be used to retain enchantments when repairing stuff, and making repairing items require that material used to make the item you are repairing. The villagers need voices, i think Charlie Brown Adult sounds would be great, *trumpets playing after trading or when hit or on death*. Maybe coral and some underwater scenery, and Underwater Temples. The end needs more content, Like Endermen being docile in the end, with ender villages with trading endermen, ender ores to make items similar to Overworld items, but a bit more enchantable. Instead of keeping your OP gear, all your stuff is stored in a chest at your spawn, and you are left with nothing, to justify the need of ender ores. This makes the ender dragon fight more interesting. A "Mother" Ghast as the nether boss, dropping ghast scales to make armor with. Also, different structural types for desert villages, instead of being sandstone recolours (Maybe half way buried buildings?). As for new tools, maybe throwing knives and battleaxes.