Percona / MySQL audit log plugin - limiting the content?
OK, from what I can tell, Percona Audit Log Plugin, has very little in the way of configuration. 

I looked at McAfee Audit Plugin, but that doesn't seem to work on Debian MySQL.

I also looked at MariaDB Audit Plugin, and that seems to have some level of filtering (DDL or DML). 
Unfortunately it requires 5.5.42 , and most of my DBs are 5.5.40. Still, on my test system it seems to work.