If possible, it would be really nice to be able to do a couple of things in the new 1.8 enchanting system via the PrepareItemEnchant event:

• Obtain the random seed used for enchanting
• Specify the text to display for an available enchantment

This would let custom enchanting behave the same way as vanilla, where the enchantments don't change (even if they are randomized), and you can see what you'll get in advance.

I honestly do not know how much of this new system is client versus server side, I would like to look into it myself if no one knows offhand.