cProjects Summary Tasks on Task Dashboard

My user would like to do the following. I need to know if this is possible. I need to know "rationale" if it's not possible.

Project has one general phase. Within that phase are summary tasks that contain 7-10 subtasks. The user wants to assign a lead to the summary task so that the lead can look at their task dashboard and see all of the high level efforts assigned to the lead's team. So the lead would only see the summary tasks displayed in his or her task dashboard.

The lead will click on a summary task that is displayed in their task dashboard. Within that subset of the project structure, the lead can see the subtasks. The user wants the lead to be able to update status, actual start, actual finish, and notes for the subtasks that belong to that summary task.

The user does not want to have all sub tasks listed on the lead's dashboard. The user just wants the lead to see the summary tasks, but still have the ability to edit the subtasks when they click on that summary task link that appears in the task dashboard.

Is this possible?

Thank you,

Wendy