Specific Special: pages should have the ability to show CentralNotice banners, and only those pages. This would create an easier to way to reach out to users of specific tools or features, in order to make sure they're aware of upcoming changes or requests for feedback, but without creating information noise for everyone else.
E.g. Being able to create a banner that only shows at [[Special:DownloadAsPdf]] pages [as for T165956: Inform users about changes in PDF rendering service - print to PDF page]
E.g. Being able to create a banner that only shows at [[Special:Block]] pages, or [[Special:AbuseFilter]] pages, etc.