Another idea I'd like to offer for consideration,
what if I'd like to be added to every bug tagging 7.x for a security need? Is there a way in bugzilla to have that happen automatically?
From my knowledge of bugzilla, you can have a default owner of bugs, but there isn't a way to automatically CC you on new bugs. Your best bet is to save a query which lists legacy bugs for 7.x which you aren't already CC'd on and run it periodiclly.
There might be a way to do it that I'm not aware of as the Jakarta-Tomcat guys have get an email update when any Tomcat bugs are updated sent to their dev list (http://nagoya.apache.org/bugzilla/) Maybe they've got some custom enhancements to their version of bugzilla. Or more likely, it could be because the default owner of each Tomcat component is the Tomcat dev list.
-Dave