Instead of having to add a bunch of GM files individually, Monsterfish_ suggests including complete folders.
Use vanilla filenames for the files to replace when loading, to load first from this folder, but with multiple possible GM folders to combine.
This is similar to the maps folder feature, but we still need compatibility for multiple folders to be loaded instead of just one.
UI for this could be a list of map folders to include, where non adjustable through the top plugin folders would be greyed out and always an empty path is added to the end when one is added (after adding one and applying, the GUI automatically reloads after prompting and adds the next possible entry for the list)
https://github.com/UnofficialCrusaderPatch/UCP3-GUI/issues/220