Instead of having people add requests to a wiki page and wait for the awesome @QChris to create the repository, we should really just have self-service repository creation that hides all of the Gerrit options and does what 98% of people want. To start with, it could just support MediaWiki extensions, so it would create the extension-FooBar group, create the mediawiki/extensions/FooBar repo, setup the GitHub mirror, and then push an initial commit of adding .gitreview. We could expand this to new skins, PHP libraries, etc. in the future. And other steps like creating a Phabricator project, and so on.
This portal could use OAuth to authenticate against wikitech, and require the user be in some arbitrary trusted group or something.