Allow option to include sub-tasks into boards

As a manager, I want to be able to see sub-tasks on the rapid board to plan the sprints and transition them in work mode. I am pretty sure this can be done as long as your filter query is not too complicated. However, since we are using a custom field to identify the sprint team, when creating a new sub-task (e.g. via GH's detail view), the custom field cannot be automatically be set to the parent team. This causes us to lose the sub-tasks in the boards unless we include them via a JQL Tricks function which then causes a permission problem (GHS-5918) that does not allow to use 'Add Sprint' anymore.

We would really like to see support for sub-tasks and allowing them to be identified via it's parent.