Due to multiple people asking if this was OP only or a permission I have changed the OP Bypass for FixIllegalEnchantments from OP only to a permission. This is useful if have specific players that you don't mind if they have illegally enchanted items.
The option and config value have changed from AllowOpBypass to just AllowBypass, you'll still have to have this set to TRUE before op's or players with that permission can have the illegally enchanted items! The wiki has been updated to show these changes.
https://github.com/dniym/IllegalStack/wiki/FixIllegalEnchants