Hard to explain but an optional blacklist, whitelist, from a client machine plugin.
Example
Plugin which would run on any operating system, but only on an admin machine to control spam blacklist by a client optional plugin install that would work under most all popular email systems or even a web browser to control blacklisted sites, white list domains, etc and send to a Astaro Server or multiple Astaro Servers but controlled by ACL rights in Astaro to a specified client machine(s).
Another example is having the option to click on an advertisement in your web browser and add to the Astaro URL blocklist, URL whitelist, URL blacklist or custom HTML content removal list by using a plugin to send to the controlling Astaro server.
I would love this option.