USER messages - default behavior

Since we will soon be able to filter USER messages by auid, I have a question about what the default behavior will be. Currently, all USER messages are captured by default, will this remain true? Or will there be a new auditctl rule to turn on or off auditing of USER messages, similar to how we have "-S all" for syscalls? Once we are able to audit by auid, will we then audit all USER messages unless the auid of the USER message matches a filter rule such as "auditctl -a exit,always -F auid!=<auid>"? Thanks, debbie