Board Thread:Support Requests - Getting Technical/@comment-26966924-20160706193551/@comment-24473195-20160706210240

Yes, it is definitely possible, but unfortunately a violation of the terms of use, and it would never pass through JS review. You can ask staff to do it through Special:Contact, but they'll likely refuse unless you can give a pretty good reason for it. One example is marvel.wikia.com that apparently asked for source editor to be set as the default.

Example: http://marvel.wikia.com/wiki/Angela_(Earth-311)?action=edit