I'm not too sure if anyone else is having an issue with full cycle testing using DPS viewer. However, I'd like to make a suggestions.
We use DPS web viewer as a way to deliver some eLearning content within the folios. e.g. Person signs in, has access to the folios, within the folios, user clicks on a link and it takes them to an assessment, upon completion of the assessment, the user receives a score (the user can also do this within the app viewer as well; however, this question is specific to the web viewer)
The problem that we have is when we release a new folio, we can only do this full cycle test in production due to only having one postback URL. Suggestion that would help overcome this is to all up to four postback URLs. development, SQA, staging, and production. Programmatically this should not be a big feature for Adobe to add, and it will help us out immensely.
Adobe Tech support, if you're monitoring this, please feel free to contact me.