The MySQL packages in Debian still do not (and will never) include inofficial feature patches (beside the redirect output of error.log to syslog in MySQL 5.0, which is now part of the official MySQL 5.1 releases) like the ones from
Percona or
Google. Of course we add important bugfixes from newer (not yet released) versions of MySQL, but no feature patches.
If you are interested in a patched version of the Debian MySQL packages, take a look at
OurDelta, their builds include patches (
complete list) like mirrored binlog and InnoDB freeze. Upgrading from the official Debian packages of MySQL to the builds from OurDelta should work without problems, but please use Launchpad when reporting bugs against their packages, and not the Debian Bug Tracking System.