The latest release from pagefault.org has created a server manager panel with a lot of features to control clamavis. You can see all the quarantined and problem messages and delete them. Reinjection still sneeds to be done at the command prompt though.
You can also schedule scans of the server hard disk, select scanning of incoming and outgoing email messages, select who to send notification messages to, specify how frequently the virus database is updated and a couple of other things that don't immediately come to mind.
You can instal it manually or using yum (which works very sweetly and easily).
Damien has done a great job of this.
If you really want to "tame" viruses and are using v6.x, you should look at virus pattern blocking.
It works great and results in clam having very little to do.
See
http://lists.contribs.org/mailman/public/devinfo/msg07431.htmlRegs
Ray