With respect @paul2009 this is really something that should have been a no brainer, logical next step in the development of discount codes.
There are many reasons why a organisation would want to upload in batch. We ourselves want to issue discount codes to individuals and schedule them in to work on a certain date. In this way we can give codes to those who need access to our food aid services on a regular basis.
Without that feature not only is this task laborious, it's also prone to human area and ultimately very, very inefficient.
I know you want to request those here to make a feature request - could you tell us please if an update on any of these types of changes are in the pipeline or forthcoming?
thanks!