If a person sets up new views, imports layouts, adds locations in the model views or other similar 'top level' tasks, the sheet set is locked down for that period of time. At all other times, which are or should be the majority of time, everyone can use the sheet set without limitations. I am not aware that people can assign who has which rights. For us, anyone who has the sheet set open can do any task - often without realizing that they temprarily lock out other people.
But it hasn't been a problem here.