Adding additional CLI arguments

[AbsoluteWisp]

I can't make sense of the code that parses the launch arguments. How could I go about adding my own arguments to configure my mod?

[AbsoluteWisp]

OK, I'll answer to myself here because I figured it out and I think it could be useful to others:
In Minecraft's main function, define an OptionSpec (like the others, one under each other), like OptionSpec<String> myModArgument = optionparser.accepts("myArgumentName").withRequiredArg();. You can explore other methods available, like .withOptionalArg(), or use different types, like Files. Once you have that, go below the argument definitions and write code that uses your new shiny optionspec object called myModArgument, using parseArgument(optionSet, myModArgument). I have no idea why this took me so long, but that's literally it.