Completed/archived cases to fly away OR filters to allow completed/archived cases to be hidden a client level

The Case view at client level is really cluttered with Cases, most of which are now complete or archived. Can you please add the functionality, as with Tasks, to hide completed Cases? Or, failing that, can you please create filters at client level so that we don't have to trawl through completed Cases to get the 'in progress' ones? Thanks Kitty