Quoting from stanhebben/MineTweaker3#341 :

1. Per-world scripts are supposed to override global scripts. (Currently they are executed first, thus their changes are voided by global scripts.)
2. The script execution order should be enforced. Many modpacks foolishly assume that scripts are executed in certain order (usually alphabetical), and such assumption have certain grounds, as tools like GNU run-parts and similar do so. But currently the only way to ensure orderly execution is to blob the scripts into one file.

Thank you in advance.