This is a very simple mod that introduces the concept of game modes. For want of a better description this allows you to set up multiple minetweaker profiles and switch between them on the fly (no server restart required) This gives you the ability to have game modes like easy and hard etc.
Documentation: https://gist.github.com/LatvianModder/715a7259379cff333fdae0a6c1f6791a
This mod is not being updated.
Take a look at PackMode by SkySom: