A very simple mod that mixins into the game to allow a modpack developer to define a default-server.properties in the root of the pack. This will then override the default creation of the server.properties file. The beauty of this method is that you only need to set the properties that you want to change by default in the default-server.properties as the game's native loading will take care of the rest.
Create a default-server.properties file in the games root folder. If there is no default-used.marker in the local folder, then the mod will attempt to load that default data in and inject it to the normal default creation of the server.properties… simples.
