I have created an external role and user. I added the user to the role, as an observer. This is good. They are limited only to the project and only to JIRA. However, we wanted to allow the software developers to continue to develop and communicate un-fettered wrt tasks and comments (comments in defects, stories, etc.). To do this, we want to limit the ability for the external user to see the tasks or comments. So far, all that we can do, is make them an observer, but cannot limit them further.