Board Thread:Support Requests - Getting Technical/@comment-11291792-20150502150454/@comment-452-20150502163630

The answer to your question, as you asked it, is no.

But if your goal is so that you have the same block options on all wikis where you're an admin, then that's possible with global.js

You can use javascript to directly alter the content of the dropdown, the content of the MediaWiki page is irrelevant - it is loaded by the server, and javascript runs in your browser.

If this your goal, I can whip something up for you. (Because the correct preparation method for javascript is whipping, but you don't want to whip too long, or you get butter.)