Redmine

It happens that some people are not involved in a project but they need to watch what happens in it or in particular issues.

An example: The boss. He is not a member of a project, but he wants to track an issue in this project. He should be able to add himself as a watcher. Also the manager of the project should be able to add the boss as a watcher.

I see the functionality this way:

1. Add new permission "Watch as non-member"
2. New/Edit issue views: Add separate drop-down list with nonmembers of the project & button "Watch"
3. When an user opens an issue of a project where he is not a member: add a button or a checkbox with function "Add me as watcher"