In bamboo we organize our build plans in project according to the actual projects in our organisation.
Each developer in the project team should be allowed to view and build all plans with the project.

In order to realize this, we need to set permissions on every plan within the project definition, which can be up to 25 builds for some projects.
Having the ability to set the permission on project and have them propagated to all build plans in the project would make bamboo even a greater tool!