VERIFIED SOLUTION i

Resolve does the MailStream Plus IBMi CHUI screen for the HEADER' parameter allows 'Start' and 'Stop' ZIP Codes when reading the input Name-Address file? Does the IBMi CHUI screen support that feature?

No, the IBMi PX "Defaults for Print Output" screen UPCPPX01  does not have those options.  See screenshot below.  
At this time, it is not felt that it is something that needs to be added, since it has always been like this, and no users have requested the option.  If a user did need to, they could modify the HEADER parameter in the PRMMSjobid @@PXT member.

User-added image
 
UPDATED:  August 29, 2018