Currently with the User Task in Forms you can only assign that task to a user. It would be very beneficial if we could supply a group name for the task. In our situation by allowing a group to be assigned to the task instead of a specific user, when a new principal or secretary is hired to replace someone, we would not have to go back into the BP and make changes for the new employee. Since we are pulling users and groups from AD and IT is already making the change, we would not have to make changes to the workflow.
Multiple people have requested this feature and I agree that it would be useful!
As a workaround for now, you can do a database look-up to find the domain account of the current principal or secretary, store that in a hidden field, and use that field's variable in the user task. This would make it a bit more dynamic.
I hope this helps!