i changed the track rule file for LGV to make super rough tracks (because why not + bumpy high speed because why not) and i want it to work in main game now. it does work in editor
I think you need to pack your plugin folder, here are too links, that I used on TSW3 Pak's: https://forums.unrealengine.com/t/how-to-use-unrealpak-exe-to-build-pak/403533/2 You can try to use this technic for your plugin.
The issue is we can't cook our plugins yet due to an issue with the automation tools with the editor. Once the team turn their attention to the editor, this will be fixed.
Matt has made it quite clear that you can't change the details of existing DLC such as LGV. You can only add stuff such as scenarios etc.