Since 1.8 has a new enchantment system, it would be great to see an implementation in Bukkit/Spigot to get and set possible enchantments for a given item.
Since enchantment options will not change in the enchantment table until an enchantment was made, it would be good to manipulate them in the PrepareItemEnchantEvent. Methods like "getEnchantments" and "setEnchantments" would be great to modify the given selection.