Hi Trevor. Can you confirm if you're currently on the Jive-x cloud version or is this Jive 8/9 single-tenant hosted? If cloud, then I don't believe that messaging can be altered. Maybe you can share a bit more on what you were looking to change based on the use case?
You might also want to post this within your support space instead or potentially a product feedback area. Since it's technical related, this best practices group might not share the same kind of developer expertise as some other areas.