Wondering if it would be possible to add a config to change the type of fuel as well as the consumption rate used by the transmog table. For example, instead of amethyst shards, I could change it to use a coin and consume half the charge.

An alternative to a config is to instead use tags. A lot of other mods have switched to using tag. Then you can dynamically add/remove items pretty easily.

You could have in the config file, just a list of all of the tags and how much they can do per 1 item.