At present, it is possible to schedule purges (deleting old revisions) from "C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate Administrator\Downloads" ("Purge updates in Manage Updates folder") and from the Distribution Centers (clu-prod and so on).  These can be scheduled to occur daily, weekly or monthly and a time can be set.

It would be useful, in circumstances where the admin notices that disk space is crucially short, if LUA 2.x had a "Purge Now" button to manually purge older files in the local copy and / or delete contents of a remote Distribution Center (DC).  Such a button may lead to complications about whether the files in these locations are actually old enough to qualify for a purge, but it would be welcome.