Bug 511269 is about setting up malone so that only bug supervisors can assign bug reports to people other than themselves or teams of which they are a member.
The problem is that the implementation is too restrictive:
"UserCannotEditBugTaskAssignee: Regular users can assign and unassign only themselves and their teams. Only project onwers, bug supervisors, drivers and release managers can assign others."
Participation in a project should be as easy as possible and In the event that the project does not have a bug supervisor anyone should be able to assign a bug task to someone. Configuring it this way also requires less work for the project owner.