For the Sitefinity backend pages, you have the option to disable crawlers from Title and Properties - Allow external search engines to index this page and include in Sitemap.
This option adds the following in the head:
To easily turn this on and off, you can create a widget and do this programatically. For example:
var pageMan = PageManager.GetManager();
var pages = pageMan.GetPageNodes().Where(p => p.RootNodeId == SiteInitializer.CurrentFrontendRootNodeId);
That way you can easily disable this on test before/after deploying. After you propagate to production, you can enable it with a click of a button.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal
and vote to affect the priority of the items