Delegate individual tasks and issues to specific people instead of all to one person

The new delegation of tasks and issues functionality is exciting, but I believe many users will find this first iteration impractical. It would be a rare scenario for us to have a user delegate ALL of their tasks and issues to one single person - who has time to carry the full workload of another user? Instead, it would be much more helpful if users could delegate tasks and issues on an individual, project, or program level.