Talismans are created through a crafting table like any other item. The crafting recipe for each talisman is configurable in each talisman's config.
If you want to disable a talisman, you can set enabled to false in the talisman's config.
Sure! Go to the API section if you want to learn how to do that.
Those of you familiar with EcoEnchants will be familiar with the extension system. It's very similar between the two plugins.
Join the discord here: Support Discord. Everyone's very happy to help you with any questions or problems that you have.