The information you provided at the end of your message helped me find it!  In the Workfront Proof HQ, if you click "Workflows," then the "Users" tab, you can change each person's default proof role. Now I can change the relevant ones to "Reviewer and Approver." Thank you 

I use the Workfront extension for InDesign and every time I generate a proof it gives people weird roles. For instance, some people are given "Reviewer & Approver" while others are given "Reviewer." I'm sure it has something to do with their role in the system, but I'd like for everyone I add to be ...