As of now, all the original estimate effort from all subtasks roll up to the Original Estimate for a User Story.
However, If any user unintentionally unchecks the "Include subtasks" in a user story, then the subtasks effort from subtasks of the user story will not roll up to the Original Estimate for the User Story.
So, it possible to make this("Include subtasks") checkbox always checked but disabled(Read only)? Please let me know.