Board Thread:General Discussion/@comment-37425278-20191120072223/@comment-9605025-20191120204216

To expand on what Applemasterexpert said:

From what I can find, I don't think RevisionDelete is an extension. It seems like it is a group of user rights that are just not assigned to anyone by default. From what I can tell, VSTF and FANDOM Utility users have the "deleterevision" right and FANDOM Utility users also have the "suppressrevision". Since they are global user groups, obviously that applies across the entire farm. As for the Scratchpad Wiki, it looks like "deleterevision" has been granted to Bureaucrats.

The only way to "enable" this for a wiki would be to ask staff. However, they don't usually change group rights without a really good reason; so don't expect them to agree to do it.