How do I disable an enchantment?
Go to config.yml
and look for Enchantments -> Disabled section. List there enchantments you would like to disable and reboot the server.
Can I create my own enchantments?
No, this is not possible and not planned.
Can I modify/disable vanilla enchantments?
No, this is not possible and not planned.
Is there a way to remove "Too Expensive" message?
No, this is a hardcoded game value. You can try to use plugins to bypass that limit, but expect broken enchantment features.