You could use server property and Smart Grouping to achieve the same. By setting a particular value the server would be selected/ de-selected into/from a Smart Group and thus operations could be done/ avoided on the servers.
No specific function that I am aware of. If your Role user /mapping/impersonation is set to a property such as _ADMIN_ACCOUNT you could set that to nouser so all jobs would fail for that target, or simply have an ACL template that would add bogus permissions to a target and just push ACL's for the same effect.
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the ACL Policy object has the concept of a maintenance window, during which you can modify acls so users are unable to run jobs or even see the object. so you create an acl policy w/ the time window you want to allow access and then apply that to the server.