Other complex extensions, such as DPL, usually have a staff member ask a few questions to ensure that the extension you are asking for is in fact the ideal solution. Other extensions, where site configuration may be dramatically changed (such as Abuse Filter), will be enabled at staff discretion depending on the context of the request. If FANDOM does not offer a particular extension, you may request our engineering staff to investigate installing it by using Special:Contact and linking to the MediaWiki extension page along with some rationale as to why it's needed.