The following article outlines instructions for adding an additional search field to the View Submitted Tasks screen in order to search tasks based on the subject of the task. Be it a user, role, group etc.
In high traffic environments, it is useful to be able to search the view submitted tasks for tasks that were performed on a particular user. Or, as a way of getting the history of all changes that were made to a particular object. Especially if these changes were unsanctioned or an error condition occurred and business flow needs to be reviewed.
Identity Manager 14.x
The above instructions also apply for the 'View My Submitted Tasks' task.