Why would they allow you to efile the NJ return but not print the return?  Can you send the client the 8879? 

How difficult is it to program that logic?  Obviously, you want to be able to review the return with your client before you even consider efiling it.  Easiest way to do that, print it to pdf and share it with them securely.  Maybe I'm missing something and there truly is a reason the print capability has not been opened yet.