Is your feature request related to a problem? Please describe.
I am the creator of the TerraFirmaGreg modpack, the use of boilers at the initial stages of game is practically impossible. Since there is simply no default water(Only fresh water(no available in GT) and salt water(available in GT)) in the TFC world.

Describe the solution you'd like
It would be cool if we added lines to the config file responsible for what liquids can be used in the boiler, perhaps some other additional elements.

Perhaps this would help other modpackmakers as well.