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Regarding your MultiUpload change
Hello. Could you please explain why did you add your feature using global function outside of mw.loader.using() call? Please follow guidelines listed on Dev Wiki:Coding conventions and ask before making significant changes to code pages maintained by other people. I'm reaching you out here instead of MediaWiki talk page because I don't want to interfere your talk with staff member about rejection of that revision.
Following Dev's coding conventions is strongly recommended, in worst case code that don't comply with them may got deleted (Using global functions may cause confusion and sometimes even more serious issues for people writing different codes, you should avoid using them anyway). And so is asking scripts' maintainers before making user-facing changes, even if you think they're only beneficial. Consider it as basic politeness before changing someone else's work.
Still, there's no harm for anyone to ask on talk page beforehand. You never know if maintainers aren't active elsewhere or they don't follow their scripts' talk pages. Otherwise community may share they thoughts and that's fine, too. Some scripts aren't maintained by one specific users but that doesn't mean you're free to make bigger changes without discussion.