It would be very useful if ktoml were to be included in this library. It works with kotlinx.serialization and TOML is an every growing format.

FLK doesn't include 3rd party libraries so that wouldn't make much sense IMO. Just JIJ it like any other library.

Another reason is that Kotlin/kotlinx-serialization#1092 states that plans for official TOML support aren't planned and TOML is quite a common config format in Minecraft mods nowadays.

I agree, we only include official kotlin libraries. You can easily JIJ it 👍