A Master - Slave replication would be nice and allow have almost 2 or more identical databases in 2 or more servers in case of failover o for balance worload (the slave could be the reporting database).
I understand the implications regarding the speed (because each insert / update / delete must to be procesed more than one time) but could be a very interesting feature in systems that are 24x7 and can not spare time in a backup o publish changes because of the database locks.)