I just gave Alex Monk (krenair) Subversion commit access to extensions, because he wanted to work on a couple of things that are still in SVN. His past contributions: https://gerrit.wikimedia.org/r/#/q/owner:krenair%2540gmail.com+project:media...
Also, I am mostly succeeding in my goal of fulfilling all developer access requests within 1 business day, so if you don't have a developer access (Git/Gerrit/Labs) account, feel free to ask for one: https://www.mediawiki.org/wiki/Developer_access