Use Case is .. Issues are being created with the "Original Estimate" left blank and put into the "To Do" status. Our staff picks up the ticket, assigns to them-self and wants to add the "Original Estimate" as part of the status transition to "In Progress". Then they begin logging work against the ticket until they move it into the "Done" status.
Permission scheme set for this project is "Any logged in user" can "Edit Own Worklogs" and "Work on Issues".