Board Thread:Support Requests - Community Management/@comment-3013425-20160415155020/@comment-5454372-20160415192927

For another possible solution, you might be able to achieve the same effect using an AbuseFilter, though you'd need to have the AbuseFilter extension activated via Special:Contact first (and I'd also wonder whether this one feature alone would warrant its activation). What I'm thinking could work for the OP's needs is:

(Haven't seen anything on Community Central against discussing the specifics of basic AbuseFilters, but if that's actually discouraged, please let me know)

Conditions:

!("sysop" in user_groups) &(moved_to_prefixedtext != moved_from_prefixedtext)

Actions taken (tick the corresponding boxes):
 * Prevent the user from performing the action in question
 * (Should probably also tick the box warning the user the action has been disallowed, but not necessary to simply prevent page renames)

For the record, it just occurred to me that you could probably also write filters which prevent the creation of pages like "The [something]" if a page named "[something]" already exists, but I'll save that for another post if needed.