Per the guidelines @ https://meta.wikimedia.org/wiki/Proposals_for_new_projects and http://community.wikia.com/wiki/Uses_of_a_wiki,
a request for a mirror of the English Wikipedia, with all pages and content, specifically as a fork for users such as Willy on Wheels, PoolGuy, MascotGuy, Voice cast vandal etc. has been approved per the decision of the Arbitration Committee.
Users should be allowed local sysop , bureaucrat access as needed, and as for checkuser and oversight.... should this be allowed for their wiki?
Either way... perhaps it needs to be on a separate cluster from the "real" Wikipedia.
There is a lot of demand for this within Wikipedia, and it could fix some of the vandalism issues if this mirror project is approved.