I have a team with a bunch of developers, a few project managers, and several managers. In my rush to get everyone access and get RTC off the ground quickly, I just gave everyone developer level access. Now a few sprints in, I see that this makes a few things ugly. The biggest problem that I am seeing is that everyone, regardless of whether they are contributing technically, is listed on the master plan. This leads to a lot of people with no line items, which just clutters the screen.

So, this is basically the break down:
Developers need to be able to modify line items and do general day to day status updates.
Project Managers need to be able to create sprints, run reports, and the like, but they don't work any any technical tasks.
Managers need only view the reports and line items to make sure that everyone is on track.

So, my question is this: How do I make it so that only developers show up in the Project Master Plan? Is there a security document somewhere that I can read to get through the different types of access that I should get?

Thanks in advance!