Unity Datamover standalone to update standby database

Standby Teradata Database,
 
I was recently commissioned by a client in Australia to do the high level design for their DR standby database.  The main requirement was to use Datamover in standalone mode.  
I found out later that the method we came up with to do this job was very similar to another job that had been done in the US.
What we found was that Teradata DB lacks a timestamp field that could have been used to help update the standby database by updating only changed data.
Has anybody else run into a similar problem and what are the plans on putting a feature in the db to allow this.